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TI-2020-13273 Aliases CVE-2020-17525GHSA-w6m8-jhpf-wj94

Remote unauthenticated denial-of-service in Subversion mod_authz_svn

Priority MEDIUM 60CWE-476Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

Subversion's mod_authz_svn module will crash if the server is using in-repository authz rules with the AuthzSVNReposRelativeAccessFile option and a client sends a request for a non-existing repository URL. This can lead to disruption for users of the service. This issue was fixed in mod_dav_svn+mod_authz_svn servers 1.14.1 and mod_dav_svn+mod_authz_svn servers 1.10.7

Why it matters now

EPSS 0.40075 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Apache Subversion (Apache Software Foundation): mod_authz_svn 1.10.7, 1.14.1Red Hat: 3 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache Subversionmod_authz_svn to before 1.14.1mod_authz_svn 1.10.7, 1.14.1Patch availableCNA
  • Apache Subversion VendorApache Affected mod_authz_svn to before 1.14.1 Fixed in mod_authz_svn 1.10.7, 1.14.1 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:apache:subversion:*:*:*:*:*:*:*:*1.9.0 to before 1.10.7; 1.11.0 to before 1.14.1VulnerableApache
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
  • cpe:2.3:a:apache:subversion:*:*:*:*:*:*:*:* Versions 1.9.0 to before 1.10.7; 1.11.0 to before 1.14.1 Vulnerable ·Apache
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian

Remediation

  • Fix · CNA Apache Subversion (Apache Software Foundation) Fixed in mod_authz_svn 1.10.7, 1.14.1

Red Hat 3 advisories

  • RHSA-2021:0508 Released 2021-02-15 · Red Hat rating Important
    subversion:1.10 security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.2) libserf-1.3.9-9.module+el8.2.0+9887+08558108.aarch64::subversion:1.10, libserf-1.3.9-9.module+el8.2.0+9887+08558108.ppc64le::subversion:1.10, libserf-1.3.9-9.module+el8.2.0+9887+08558108.s390x::subversion:1.10 +37
  • RHSA-2021:0507 Released 2021-02-15 · Red Hat rating Important
    subversion:1.10 security update
    • Red Hat Enterprise Linux AppStream (v. 8) libserf-1.3.9-9.module+el8.3.0+6671+2675c974.aarch64::subversion:1.10, libserf-1.3.9-9.module+el8.3.0+6671+2675c974.ppc64le::subversion:1.10, libserf-1.3.9-9.module+el8.3.0+6671+2675c974.s390x::subversion:1.10 +37
  • RHSA-2021:0509 Released 2021-02-15 · Red Hat rating Important
    subversion:1.10 security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.1) libserf-1.3.9-9.module+el8.1.0+9889+0a9c19c4.aarch64::subversion:1.10, libserf-1.3.9-9.module+el8.1.0+9889+0a9c19c4.ppc64le::subversion:1.10, libserf-1.3.9-9.module+el8.1.0+9889+0a9c19c4.s390x::subversion:1.10 +37

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:0507
Red Hat Enterprise Linux AppStream EUS (v. 8.1)Fixed RHSA-2021:0509
Red Hat Enterprise Linux AppStream EUS (v. 8.2)Fixed RHSA-2021:0508
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-17525
  2. 2026-10-03 Alias added: GHSA-w6m8-jhpf-wj94

References

Exploit 1

Advisory 1

  • TI-2015-04418 Integer overflow in the read_string function in libsvn_ra_svn/marshal.c in Apache… CVSS 3.0HIGH 8.6
  • TI-2018-08457 Subversion's mod_dav_svn Apache HTTPD module versions 1.11.0 and 1.10.0 to 1.10.3 will… CVSS 3.1HIGH 7.5
  • TI-2017-07180 Improper input validation in Apache Subversion CVSS 3.0CRITICAL 9.8
  • TI-2015-04497 Integer overflow in util.c in mod_dav_svn in Apache Subversion 1.7.x, 1.8.x before… CVSS 3.0HIGH 7.6
  • TI-2013-01858 contrib/hook-scripts/svn-keyword-check.pl in Subversion before 1.6.23 allows remote… CVSS 2.0HIGH 7.1
  • TI-2013-01661 The mod_dav_svn Apache HTTPD server module in Subversion 1.7.0 through 1.7.8 allows… CVSS 2.0MEDIUM 5.0
See all 46 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences