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Full vulnerability report · 2025
CVE-2025-49630High confidence

Apache HTTP Server: mod_proxy_http2 denial of service

Apache Software Foundation · Apache HTTP Server

7.5HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 1.30% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Apache Software Foundation Apache HTTP 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 30 daysRemediation target: Within 180 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.

Distribution package intelligence

Release-specific package status

Alpine, Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

8 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Alpine v3.23v3.23 · mainapache2Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.4.64-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.22v3.22 · mainapache2Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.4.64-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.21v3.21 · mainapache2Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.4.64-r0Alpine Security Database ↗Source updated 3 Oct 2026
Debian trixietrixie · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.64-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.65-1~deb12u1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.64-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.64-1Debian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · standard archiveapache2Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.2.4.58-1ubuntu8.7Canonical Ubuntu Security ↗Source updated 6 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2025-49630 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityhttpd: mod_proxy_http2: untrusted input from a client causes an assertion to fail in the Apache mod_proxy_http2 module
462 fixed

The vendor explicitly identifies these products or versions as containing the fix.

  • jbcs-httpd24-httpd-0:2.4.62-8.el7jbcs.src as a component of Red Hat JBoss Core Services on RHEL 7 Server
  • jbcs-httpd24-httpd-0:2.4.62-8.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
  • jbcs-httpd24-httpd-debuginfo-0:2.4.62-8.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
  • jbcs-httpd24-httpd-devel-0:2.4.62-8.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
  • jbcs-httpd24-httpd-manual-0:2.4.62-8.el7jbcs.noarch as a component of Red Hat JBoss Core Services on RHEL 7 Server
  • jbcs-httpd24-httpd-selinux-0:2.4.62-8.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
  • jbcs-httpd24-httpd-tools-0:2.4.62-8.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
  • jbcs-httpd24-mod_http2-0:2.0.29-5.el7jbcs.src as a component of Red Hat JBoss Core Services on RHEL 7 Server
  • jbcs-httpd24-mod_http2-0:2.0.29-5.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
  • jbcs-httpd24-mod_http2-debuginfo-0:2.0.29-5.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
  • jbcs-httpd24-mod_jk-0:1.2.50-9.redhat_1.el7jbcs.src as a component of Red Hat JBoss Core Services on RHEL 7 Server
  • jbcs-httpd24-mod_jk-ap24-0:1.2.50-9.redhat_1.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
Summary
An assertion failure flaw was found in Apache httpd. Untrusted clients can send inputs that trigger an assertion failure in the mod_proxy_http2 module, which likely results in an Apache HTTP server crash or denial of service (DoS).
Remediation
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
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-2025-21017

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost set to "on".

What

In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost set to "on".

Why

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost set to "on".

Why

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

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.
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
a network path → Reachable Assertion → disrupt the affected service
Attack surface
Network
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-617 ↗

CWE-617: Reachable Assertion. The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

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

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

AVNetworkAttack vector: The vulnerable component can be reached over a network.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.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
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.
NetworkUnauthenticatedDenial of serviceCWE-617
A

Official authority intelligence

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

BSI · German · WID-SEC-2025-1529Apache HTTP Server: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Apache HTTP Server ausnutzen, um einen Denial of Service Angriff durchzuführen, um Sicherheitsvorkehrungen zu umgehen, um Informationen offenzulegen, und um Dateien zu manipulieren.

Official advisory ↗
BSI · German · WID-SEC-2025-1850Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Ein Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20250716Security Bulletin 16 Jul 2025 [922 KB]

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 16 Jul 2025 [922 KB], published on 16 July 2025. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0162Multiples vulnérabilités dans Juniper Networks Secure Analytics

d?id=CVE-2025-38461 Référence CVE CVE-2025-38498 https://www.cve.org/CVERecord?id=CVE-2025-38498 Référence CVE CVE-2025-38527 https://www.cve.org/CVERecord?id=CVE-2025-38527 Référence CVE CVE-2025-38556 https://www.cve.org/CVERecord?id=CVE-2025-38556 Référence CVE CVE-2025-38718 https://www.cve.org/CVERecord?id=CVE-2025-38718 Référence CVE CVE-2025-39730 https://www.cve.org/CVERecord?id=CVE-2025-39730 Référence CVE CVE-2025-39757 https://www.cve.org/CVERecord?id=CVE-2025-39757 Référence CVE CVE-2025-40928 https://www.cve.org/CVERecord?id=CVE-2025-40928 Référence CVE CVE-2025-41244 https://www.cve.org/CVERecord?id=CVE-2025-41244 Référence CVE CVE-2025-49630 https://www.cve.org/CVERecord?id=CVE-2025-49630 Référence CVE CVE-2025-49812 https://www.cve.org/CVERecord?id=CVE-2025-49812 Référence CVE CVE-2025-5318 https://www.cve.org/CVERecord?id=CVE-2025-5318 Référence CVE CVE-2025-55752 https://www.cve.org/CVERecord?id=CVE-2025-55752 Référence CVE CVE-2025-61795 https://www.cve.org/CVERecord?id=CVE-2025-61795 Référence CVE CVE-2025-6395 https://www.cve.org/CVERecord?id=CVE-2025-6395 Gestion détaillée du document le 13 février 2026 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propos Contact cyber.gouv.fr service-public.fr legifrance.gouv.fr info.gouv.fr

Official advisory ↗
CERT-FR · French · CERTFR-2025-AVI-1065Multiples vulnérabilités dans NetApp ONTAP

De multiples vulnérabilités ont été découvertes dans NetApp ONTAP. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service à distance, une atteinte à la confidentialité des données et une atteinte à l'intégrité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2025-AVI-1013Multiples vulnérabilités dans les produits IBM

ord?id=CVE-2025-38556 Référence CVE CVE-2025-38718 https://www.cve.org/CVERecord?id=CVE-2025-38718 Référence CVE CVE-2025-39730 https://www.cve.org/CVERecord?id=CVE-2025-39730 Référence CVE CVE-2025-39757 https://www.cve.org/CVERecord?id=CVE-2025-39757 Référence CVE CVE-2025-40928 https://www.cve.org/CVERecord?id=CVE-2025-40928 Référence CVE CVE-2025-41244 https://www.cve.org/CVERecord?id=CVE-2025-41244 Référence CVE CVE-2025-4565 https://www.cve.org/CVERecord?id=CVE-2025-4565 Référence CVE CVE-2025-47273 https://www.cve.org/CVERecord?id=CVE-2025-47273 Référence CVE CVE-2025-49146 https://www.cve.org/CVERecord?id=CVE-2025-49146 Référence CVE CVE-2025-49630 https://www.cve.org/CVERecord?id=CVE-2025-49630 Référence CVE CVE-2025-49812 https://www.cve.org/CVERecord?id=CVE-2025-49812 Référence CVE CVE-2025-50059 https://www.cve.org/CVERecord?id=CVE-2025-50059 Référence CVE CVE-2025-50106 https://www.cve.org/CVERecord?id=CVE-2025-50106 Référence CVE CVE-2025-53057 https://www.cve.org/CVERecord?id=CVE-2025-53057 Référence CVE CVE-2025-53066 https://www.cve.org/CVERecord?id=CVE-2025-53066 Référence CVE CVE-2025-5318 https://www.cve.org/CVERecord?id=CVE-2025-5318 Référence CVE CVE-2025-55752 https://www.cve.org/CVERecord?id=CVE-2025-55752 Référence CVE CVE-2025-61795 https://www.cve.org/CVERecord?id=CV

Official advisory ↗
CERT-FR · French · CERTFR-2025-AVI-0751Multiples vulnérabilités dans les produits VMware

.org/CVERecord?id=CVE-2025-4138 Référence CVE CVE-2025-4330 https://www.cve.org/CVERecord?id=CVE-2025-4330 Référence CVE CVE-2025-4435 https://www.cve.org/CVERecord?id=CVE-2025-4435 Référence CVE CVE-2025-4516 https://www.cve.org/CVERecord?id=CVE-2025-4516 Référence CVE CVE-2025-4517 https://www.cve.org/CVERecord?id=CVE-2025-4517 Référence CVE CVE-2025-4673 https://www.cve.org/CVERecord?id=CVE-2025-4673 Référence CVE CVE-2025-4674 https://www.cve.org/CVERecord?id=CVE-2025-4674 Référence CVE CVE-2025-47907 https://www.cve.org/CVERecord?id=CVE-2025-47907 Référence CVE CVE-2025-49007 https://www.cve.org/CVERecord?id=CVE-2025-49007 Référence CVE CVE-2025-49630 https://www.cve.org/CVERecord?id=CVE-2025-49630 Référence CVE CVE-2025-49812 https://www.cve.org/CVERecord?id=CVE-2025-49812 Référence CVE CVE-2025-50059 https://www.cve.org/CVERecord?id=CVE-2025-50059 Référence CVE CVE-2025-50088 https://www.cve.org/CVERecord?id=CVE-2025-50088 Référence CVE CVE-2025-50106 https://www.cve.org/CVERecord?id=CVE-2025-50106 Référence CVE CVE-2025-53020 https://www.cve.org/CVERecord?id=CVE-2025-53020 Référence CVE CVE-2025-7339 https://www.cve.org/CVERecord?id=CVE-2025-7339 Référence CVE CVE-2025-7783 https://www.cve.org/CVERecord?id=CVE-2025-7783 Gestion détaillée du document le 03 septembre 2025 Version initial

Official advisory ↗
CERT-FR · French · CERTFR-2025-AVI-0740Multiples vulnérabilités dans Tenable Security Center

De multiples vulnérabilités ont été découvertes dans Tenable Security Center. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service à distance, une atteinte à la confidentialité des données et une atteinte à l'intégrité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2025-AVI-0586Multiples vulnérabilités dans Apache HTTP Server

De multiples vulnérabilités ont été découvertes dans Apache HTTP Server. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service à distance, une atteinte à la confidentialité des données et une atteinte à l'intégrité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2025-010193Apache Software Foundation の Apache HTTP Server における到達可能なアサーションに関する脆弱性

Apache Software Foundation の Apache HTTP Server には、到達可能なアサーションに関する脆弱性が存在します。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-003910Cosminexus HTTP Serverにおける複数の脆弱性

Cosminexus HTTP Serverに下記の脆弱性が存在します。 CVE-2025-49630, CVE-2025-53020 HTTP/2プロトコル通信機能を使用していない場合は，本脆弱性は発生しません。

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
Apache HTTP Server: 2.4.26 ≤ 2.4.63
Fixed
Action
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 10 Jul 2025 · Last source change 4 Nov 2025, 21:11 UTC · CWE-617 · Reachable Assertion

CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
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-2025-21017
Product sourceCNA
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
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. Affected versionsThe structured affected or fixed version information changed.
    Before
    2.4.26 ≤ 2.4.63 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    2.4.26 ≤ 2.4.63 · Fixed: Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  2. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Red Hat Product Security ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2025-21017↗Red Hat Product Security security 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.
Free version - for non-commercial use only.CVE-2025-49630 · cve.blacktree.nl