CVE-2019-0622: Microsoft Skype: Improper Authentication

Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Fix not verified

What, why and how

An elevation of privilege vulnerability exists when Skype for Andriod fails to properly handle specific authentication requests, aka "Skype for Android Elevation of Privilege Vulnerability." This affects Skype 8.35.

What

Why

The affected component does not establish the requesting party's identity reliably before granting access.

How

An attacker operating through physical access may attempt exploitation without authentication or user interaction. If successful, the issue may gain additional privileges.

What

Why

The affected component does not establish the requesting party's identity reliably before granting access.

How

An attacker operating through physical access may attempt exploitation without authentication or user interaction. If successful, the issue may gain additional privileges.

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.

No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

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: physical access → Improper Authentication → gain additional privileges
Attack surface: Physical
Privileges required: None: unauthenticated exploitation is possible
User interaction: None
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-287 ↗
CWE-287: Improper Authentication. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Common Vulnerability Scoring System 3.0: the compact vector below is decoded into plain language.
AVPhysicalAttack vector: The attacker needs physical 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.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land: No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.

UnauthenticatedPrivilege escalationCWE-287

Official authority intelligence

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

ENISA EUVD · EUVD-2019-1386Official EUVD mapping

0 linked advisory records.

Official EUVD record ↗

CERT-FR · French · CERTFR-2019-AVI-011Multiples vulnérabilités dans les produits Microsoft

De multiples vulnérabilités ont été corrigées dans les produits Microsoft . Elles permettent à un attaquant de provoquer une élévation de privilèges, une atteinte à la confidentialité des données, une exécution de code à distance et une usurpation d'identité.

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2019-001453Skype for Andriod における権限を昇格される脆弱性

Skype for Andriod には、特定の認証要求の適切な処理に失敗した場合、権限を昇格される脆弱性が存在します。ベンダは、本脆弱性を「Skype for Android の特権の昇格の脆弱性」として公開しています。

Official advisory ↗

KISA KrCERT/CC · Korean · KNVD-4967MS 1월 보안 위협에 따른 정기 보안 업데이트 권고

udio 보안 업데이트 ##### □ 설명 o 공격자가 프로그램의 미흡한 설계(적절한 검증 부재)를 악용하여 제한된 자원에 접근가능한 정보노출 취약점 o 관련취약점 : - 정보노출 취약점(CVE-2019-0537) o 영향 : 정보노출 o 중요도 : 중요 o 관련 KB번호 - 4476698, 4476755 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 11. SharePoint Server, SharePoint Enterprise Server 보안 업데이트 ##### □ 설명 o 이용자가 특수하게 제작된 악성 문서를 열람할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2019-0585) - 권한상승 취약점(CVE-2019-0562) o 영향 : 원격코드실행 o 중요도 : 중요 o 관련 KB번호 - 4461598, 4461591, 4461634, 4461589 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 12. Skype 보안 업데이트 ##### □ 설명 o 공격자가 프로그램 버그(실행 처리 구문의 허점 등)을 악용하여 보호되는 자원들에 임의로 접근하는 권한상승 취약점 o 관련취약점 : - 권한상승 취약점(CVE-2019-0622) o 영향 : 권한상승 o 중요도 : 보통 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 13. Exchange Server 보안 업데이트 ##### □ 설명 o 공격자가 특수하게 제작된 악성 응용 프로그램을 실행할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2019-0586) - 정보노출 취약점(CVE-2019-0588) o 영향 : 원격코드실행 o 중요도 : 중요 o 관련 KB번호 - 4471389, 4468742 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 14. ASP.NET Core, .NET Core 보안 업데이트 ##### □ 설명 o 공격자가 시스템의 자원을 고갈시켜 발생하는 서비스거부 취약점 o 관련취약점 : - 서비스거부 취약점(CVE-2019-0548,CVE-2019-0564) - 정보노출 취약점(CVE-2019-0545) o 영향 : 서비스거부 o 중요도 : 중요 o 관련 KB번호 - 4480063, 4480085, 4480064, 4480086, 4480061, 4480083, 4480961, 4480962, 4480973, 4480978, 4480966, 4480056, 448

Official advisory ↗

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.: Fix not verified
Affected: Skype: 8.35 when installed on Android Devices
Fixed: No fixed version is explicitly recorded in the structured CVE data.
Action: No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround: No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.

Evidence and provenance

Published 8 Jan 2019 · Last source change 4 Aug 2024, 17:51 UTC · CWE-287 · Improper Authentication

CVE recordCVE.org · 5.1

CVSS sourceNIST NVD

EPSS source

The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.

FIRST · tracked since 2026-09-01

European sourceENISA EUVD · EUVD-2019-1386

Product sourceCNA

Remediation sourceCVE/CNA references

CWE sourceNIST NVD

NVD statusNVD modified after enrichment

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

Material change intelligence

What changed after publication

View recent updates ↗

1 Sep 2026, 02:42 UTC
ENISA EUVD mappingEUVD-2019-1386 was added to the official ENISA EUVD mapping for this CVE.
Before
not recorded
After
{"euvdId":"EUVD-2019-1386"}
ENISA EUVD ↗
4 Aug 2024, 17:51 UTC
Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: portal.msrc.microsoft.com/CVE-2019-0622.
Before
no authoritative guidance recorded
After
vendor advisory: portal.msrc.microsoft.com/CVE-2019-0622
portal.msrc.microsoft.com ↗
4 Aug 2024, 17:51 UTC
SeveritySeverity changed from Unknown to Medium.
Before
Unknown
After
Medium
NIST NVD ↗
4 Aug 2024, 17:51 UTC
CVSS scoreCVSS score changed from not recorded to 4.6 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
Before
not recorded
After
4.6 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
NIST NVD ↗
4 Aug 2024, 17:51 UTC
Catalogue recordCVE added to the BlackTree catalogue.
CNA ↗

2019-01-08CVE published

ENISA EUVD · EUVD-2019-1386↗Vendor advisory↗CVE authority or vendor 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.

Microsoft Skype: Improper Authentication

Published severity in operational context

Evidence used

Compensating controls

Verification

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

ENISA European Vulnerability Database

EUVD-2019-1386

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

What changed after publication