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Full vulnerability report · 2021
CVE-2021-26857High confidence

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft · Exchange Server

7.8HighCVSS 3.1
Recommended action
Patch now

CISA confirms exploitation in the wild and lists 2022-05-03 as the remediation due date.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Critical, raised one band.upgradedsince 3 Nov 2021

Evidence used

  • CISA confirms exploitation in the wild.
  • EPSS is 95.76% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Microsoft Exchange Server and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2021-13641

CISA KEV mirrored by ENISA

Microsoft Exchange Server Remote Code Execution Vulnerability

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 3 Nov 2021. Evidence sources: cisa_kev.
ENISA score
7.8 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2022-05-03 as the remediation due date.

Patch available
01

What, why and how

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

What

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may execute code or commands in the affected security context.

What

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2021-11-03. Known ransomware campaign use is recorded.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Deserialization of Untrusted Data → execute code or commands in the affected security context
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-502 ↗

CWE-502: Deserialization of Untrusted Data. The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
UnauthenticatedRemote code executionCWE-502CISA KEV
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2021-13641Known-exploited evidence recorded

Microsoft Exchange Server Remote Code Execution Vulnerability

Official EUVD record ↗
Canadian Centre for Cyber Security · English · AL21-007APT Actors Target U.S. and Allied Networks - update 1

On 15 April 2021, the NSA, CISA, and FBI issued a Joint Cybersecurity Advisory [ 1 ], drawing attention to widespread scanning and exploitation of several vulnerabilities by APT actors. The advisory states that the APT actors are targeting vulnerable systems to obtain authentication credentials and enable further access within networks, including national security and government systems. Examples of recent activity include compromising SolarWinds Orion updates, targeting COVID-19 research facilities, and leveraging a VMWare vulnerability for authentication abuse. The Cybersecurity Advisory highlights the following vulnerabilities being exploited: CVE-2018-13379 Fortinet [ 2 ], [ 3 ] CVE-2019-9670 Zimbra [ 3 ] CVE-2019-11510 Pulse Secure [ 3 ], [ 4 ] CVE-2019-19781 Citrix [ 3 ] CVE-2020-4006 VMware [ 5 ] UPDATE 1 [ 6 ] CVE-2020-5902 F5 Big-IP CVE-2020-14882 Oracle WebLogic CVE-2021-21972 VMWare vSphere CVE-2019-1653 Cisco router CVE-2019-2725 Oracle WebLogic Server CVE-2019-7609 Kibana CVE-2021-26857 Exchange (SOAP payload) CVE-2021-26858 Exchange (Arbitrary files) CVE-2021-27065 Exchange (Arbitrary files) The Cyber Centre is highlighting this advisory, as it provides important information to system owners and operators responsible for defending their systems and networks from cyber threats. There are software updates and mitigations for these vulnerabilities. See past reporting by the Cyber Center and partners for more details. Should activity matching the content of this Alert be discovered, recipients are encouraged to contact the Cyber Centre by email ( contact@cyber.gc.ca ) or by telephone ( 1-833-CYBER-88 or 1-833-292-3788 ).

Official advisory ↗
Canadian Centre for Cyber Security · English · AL21-003Active Exploitation of Microsoft Exchange Vulnerabilities - update 4

On 2 March 2021, Microsoft published several security updates for Microsoft Exchange Server to address vulnerabilities that have reportedly been used in limited targeted compromises. Security researcher Volexity has reported that the activity appears to have started as early as January 6, 2021.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20210310Security Bulletin 10 Mar 2021

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 10 Mar 2021, published on 10 March 2021. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-156Multiples vulnérabilités dans Microsoft Exchange Server

De multiples vulnérabilités ont été découvertes dans Microsoft Exchange Server. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-001172Microsoft Exchange Server におけるリモートでコードを実行される脆弱性

Microsoft Exchange Server には、リモートでコードを実行される脆弱性が存在します。 本脆弱性は、CVE-2021-26412、CVE-2021-26854、CVE-2021-26855、CVE-2021-26857、CVE-2021-26858、CVE-2021-27065 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-001133Microsoft Exchange Server におけるリモートでコードを実行される脆弱性

Microsoft Exchange Server には、リモートでコードを実行される脆弱性が存在します。 本脆弱性は、CVE-2021-26412、CVE-2021-26854、CVE-2021-26857、CVE-2021-26858、CVE-2021-27065、CVE-2021-27078 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-001131Microsoft Exchange Server におけるリモートでコードを実行される脆弱性

Microsoft Exchange Server には、リモートでコードを実行される脆弱性が存在します。 本脆弱性は、CVE-2021-26854、CVE-2021-26855、CVE-2021-26857、CVE-2021-26858、CVE-2021-27065、CVE-2021-27078 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-001171Microsoft Exchange Server におけるリモートでコードを実行される脆弱性

Microsoft Exchange Server には、リモートでコードを実行される脆弱性が存在します。 本脆弱性は、CVE-2021-26412、CVE-2021-26854、CVE-2021-26855、CVE-2021-26857、CVE-2021-26858、CVE-2021-27078 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-001170Microsoft Exchange Server におけるリモートでコードを実行される脆弱性

Microsoft Exchange Server には、リモートでコードを実行される脆弱性が存在します。 本脆弱性は、CVE-2021-26412、CVE-2021-26854、CVE-2021-26855、CVE-2021-26857、CVE-2021-27065、CVE-2021-27078 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-001169Microsoft Exchange Server におけるリモートでコードを実行される脆弱性

Microsoft Exchange Server には、リモートでコードを実行される脆弱性が存在します。 本脆弱性は、CVE-2021-26412、CVE-2021-26854、CVE-2021-26855、CVE-2021-26858、CVE-2021-27065、CVE-2021-27078 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-001132Microsoft Exchange Server におけるリモートでコードを実行される脆弱性

Microsoft Exchange Server には、リモートでコードを実行される脆弱性が存在します。 本脆弱性は、CVE-2021-26412、CVE-2021-26855、CVE-2021-26857、CVE-2021-26858、CVE-2021-27065、CVE-2021-27078 とは異なる脆弱性です。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5282MS 3월 보안 위협에 따른 정기 보안 업데이트 권고

microsoft.com/update-guide/releaseNote/2021-Mar o 취약점 요약 정보 제품 카테고리 CVE 번호 CVE 제목 .NET Core CVE-2021-26701 .NET Core 원격 코드 실행 취약성 Application Virtualization CVE-2021-26890 응용 프로그램 가상화 원격 코드 실행 취약성 Azure CVE-2021-27075 Azure 가상 컴퓨터 정보 유출 취약성 Azure Sphere CVE-2021-27080 Azure Sphere 미서명 코드 실행 취약성 CVE-2021-27074 Azure Sphere 미서명 코드 실행 취약성 Internet Explorer CVE-2021-27085 Internet Explorer 원격 코드 실행 취약성 CVE-2021-26411 Internet Explorer 메모리 손상 취약성 Microsoft ActiveX CVE-2021-26869 Windows ActiveX 설치 관리자 서비스 정보 유출 취약성 Microsoft Exchange Server CVE-2021-27065 Microsoft Exchange Server 원격 코드 실행 취약성 CVE-2021-26858 Microsoft Exchange Server 원격 코드 실행 취약성 CVE-2021-26857 Microsoft Exchange Server 원격 코드 실행 취약성 CVE-2021-26855 Microsoft Exchange Server 원격 코드 실행 취약성 Microsoft Graphics Component CVE-2021-27077 Windows Win32k 권한 상승 취약성 CVE-2021-26876 OpenType 글꼴 구문 분석 원격 코드 실행 취약성 CVE-2021-26875 Windows Win32k 권한 상승 취약성 CVE-2021-26868 Windows 그래픽 구성 요소 권한 상승 취약성 CVE-2021-26863 Windows Win32k 권한 상승 취약성 CVE-2021-26861 Windows 그래픽 구성 요소 원격 코드 실행 취약성 Microsoft Office CVE-2021-27059 Microsoft Office 원격 코드 실행 취약성 CVE-2021-27058 Microsoft Office 간편 실행 원격 코드 실행 취약성 CVE-2021-24108 Microsoft Office 원격 코드 실행 취약성 CVE-2021-27057 Microsoft Office 원격 코드 실행 취약성 CVE-2021-27054 Microsoft Excel 원격 코드 실행 취약성 CVE-2021-27053 Microsoft

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5270MS Exchange Server 취약점 임시 조치 방안

URL Re-Write모듈(https://www.iis.net/downloads/microsoft/url-rewrite)과 BackendCookieMitigation.ps1(https://github.com/microsoft/CSS-Exchange/tree/main/Security) 파일 필요 .\BackendCookieMitigation.ps1 ?FullPathToMSI “FullLocalPathToMSI” - WebSiteNames “Default Web Site” -Verbose o IIS Re-Write 모듈을 설치하지 않고 IIS Re-Write Rule을 생성하는 경우의 Powershell 명령 예시 .\BackendCookieMitigation.ps1 ?WebSiteNames “Default Web Site” -Verbose o 변경 사항을 되돌리려는 경우 .\BackendCookieMitigation.ps1 ?WebSiteNames “Default Web Site” -RollBackMitigation -Verbose o Re-Write Rule 상태 확인 - C:\inetpub\wwwroot\web.config 혹은 Default Web Site의 IIS UI에서 Re-Write Rule 확인 ##### □ UM 서비스 비활성화(CVE-2021-26857 예방) o Exchange 관리 쉘(shell)을 이용, 아래 명령 실행 Set-ServerComponentState ?Component UMCallRouter ?Identity “ComputerName” - Requester Maintenance ?State Inactive Stop-Service MSExchangeUM Set-Service MSExchangeUM ?StartupType Disabled Stop-Service MSExchangeUMCR Set-Service MSExchangeUMCR ?StartupType Disabled o Exchange 관리 쉘(shell)을 이용, UM 서비스 상태 확인 Get-Service MSExchangeUM Get-Service MSExchangeUMCR Get-ServerComponentState ?Identity “ComputerName” -Component UMCallRouter | fl ##### □ ECP Application Pool 비활성화(CVE-2021-27065 예방) o Exchange 관리 쉘(shell)을 이용, 아래 명령 실행 Set-ServerComponentState ?Component EcpProxy ?Identity “ComputerName” - Requester

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5269MS Exchange Server 취약점 보안 점검 권고

MS Exchange Server에서 발견된 취약점(CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065)과 취약점을 악용한 악성 스크립트 여부 탐지 및 조치 방안 안내

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5267MS Exchange 서버 취약점 보안 업데이트 권고

Exchange 서버에서 안전하지 않은 역직렬화로 인해 발생하는 임의코드실행 취약점(CVE-2021-26857) [3]

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 2 Mar 2021 · Last source change 19 Aug 2026, 16:30 UTC · CWE-502 · Deserialization of Untrusted Data

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2021-13641
Product sourceCISA KEV
Remediation sourceCVE/CNA references
CWE sourceCISA ADP
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    14.0.0.0 < 14.03.0513.000; 15.00.0 < 15.00.1395.012; 15.00.0 < 15.00.1473.006; 15.00.0 < 15.00.1497.012; 15.00.0 < 15.00.0847.064; 15.01.0 < 15.01.1531.012; 15.01.0 < 15.01.1591.018; 15.01.0 < 15.01.1713.010 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    Microsoft Exchange Server 2010 Service Pack 3: 14.0.0.0 < 14.03.0513.000; Microsoft Exchange Server 2013 Cumulative Update 21: 15.00.0 < 15.00.1395.012; Microsoft Exchange Server 2013 Cumulative Update 22: 15.00.0 < 15.00.1473.006; Microsoft Exchange Server 2013 Cumulative Update 23: 15.00.0 < 15.00.1497.012; Microsoft Exchange Server 2013 Service Pack 1: 15.00.0 < 15.00.0847.064; Microsoft Exchange Server 2016 Cumulative Update 10: 15.01.0 < 15.01.1531.012; Microsoft Exchange Server 2016 Cumulative Update 11: 15.01.0 < 15.01.1591.018; Microsoft Exchange Server 2016 Cumulative Update 12: 15.01.0 < 15.01.1713.010; Microsoft Exchange Server 2016 Cumulative Update 13: 15.01.0 < 15.01.1779.008; Microsoft Exchange Server 2016 Cumulative Update 14: 15.01.0 < 15.01.1847.012; Microsoft Exchange Server 2016 Cumulative Update 15: 15.01.0 < 15.01.1913.012; Microsoft Exchange Server 2016 Cumulative Update 16: 15.01.0 < 15.01.1979.008; Microsoft Exchange Server 2016 Cumulative Update 17: 15.01.0 < 15.01.2044.013; Microsoft Exchange Server 2016 Cumulative Update 18: 15.01.0 < 15.01.2106.013; Microsoft Exchange Server 2016 Cumulative Update 19: 15.01.0 < 15.01.2176.009; Microsoft Exchange Server 2016 Cumulative Update 8: 15.01.0 < 15.01.1415.010; Microsoft Exchange Server 2016 Cumulative Update 9: 15.01.0 < 15.01.1466.016; Microsoft Exchange Server 2019: 15.02.0 < 15.02.0221.018; Microsoft Exchange Server 2019 Cumulative Update 1: 15.02.0 < 15.01.1979.006; Microsoft Exchange Server 2019 Cumulative Update 2: 15.02.0 < 15.02.0397.011; Microsoft Exchange Server 2019 Cumulative Update 3: 15.02.0 < 15.02.0464.015; Microsoft Exchange Server 2019 Cumulative Update 4: 15.02.0 < 15.02.0659.012; Microsoft Exchange Server 2019 Cumulative Update 5: 15.02.0 < 15.02.0595.008; Microsoft Exchange Server 2019 Cumulative Update 6: 15.02.0 < 15.02.0529.013; Microsoft Exchange Server 2019 Cumulative Update 7: 15.02.0 < 15.02.0721.013; Microsoft Exchange Server 2019 Cumulative Update 8: 15.02.0 < 15.02.0792.010 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added patch: msrc.microsoft.com/CVE-2021-26857; added remediation: msrc.microsoft.com/CVE-2021-26857; removed remediation: portal.msrc.microsoft.com/CVE-2021-26857.
    Before
    patch: portal.msrc.microsoft.com/CVE-2021-26857 · remediation: portal.msrc.microsoft.com/CVE-2021-26857
    After
    patch: msrc.microsoft.com/CVE-2021-26857 · patch: portal.msrc.microsoft.com/CVE-2021-26857 · remediation: msrc.microsoft.com/CVE-2021-26857
    secure@microsoft.com ↗
  3. Vendor guidanceAuthoritative vendor guidance changed: added remediation: portal.msrc.microsoft.com/CVE-2021-26857; removed patch: msrc.microsoft.com/CVE-2021-26857; removed remediation: msrc.microsoft.com/CVE-2021-26857.
    Before
    patch: msrc.microsoft.com/CVE-2021-26857 · patch: portal.msrc.microsoft.com/CVE-2021-26857 · remediation: msrc.microsoft.com/CVE-2021-26857
    After
    patch: portal.msrc.microsoft.com/CVE-2021-26857 · remediation: portal.msrc.microsoft.com/CVE-2021-26857
    portal.msrc.microsoft.com ↗
  4. Vendor guidanceAuthoritative vendor guidance changed: added patch: msrc.microsoft.com/CVE-2021-26857; added remediation: msrc.microsoft.com/CVE-2021-26857; removed remediation: portal.msrc.microsoft.com/CVE-2021-26857.
    Before
    patch: portal.msrc.microsoft.com/CVE-2021-26857 · remediation: portal.msrc.microsoft.com/CVE-2021-26857
    After
    patch: msrc.microsoft.com/CVE-2021-26857 · patch: portal.msrc.microsoft.com/CVE-2021-26857 · remediation: msrc.microsoft.com/CVE-2021-26857
    msrc.microsoft.com ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    15.01.0 < publication; 15.02.0 < publication; 15.00.0 < publication · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    14.0.0.0 < 14.03.0513.000; 15.00.0 < 15.00.1395.012; 15.00.0 < 15.00.1473.006; 15.00.0 < 15.00.1497.012; 15.00.0 < 15.00.0847.064; 15.01.0 < 15.01.1531.012; 15.01.0 < 15.01.1591.018; 15.01.0 < 15.01.1713.010 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2021-13641↗CISA KEV record↗CVE authority or vendor reference↗Patch or update reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2021-26857 · cve.blacktree.nl