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No exploitation reportedFix available

CVE-2020-17525

No exploitation reported by the sources we read.

  • Published2021-03-17
  • Fixed in1.14.1 · 1.10.7
  • WeaknessCWE-476

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2021-03-1710:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-17525?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-17525?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Apache subversion
BranchAffectedFixed in
1.x≥ 1.11.0, < 1.14.11.14.1
1.x≥ 1.9.0, < 1.10.71.10.7
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libserfRocky Linux:8all versions · fixed in 0:1.3.9-9.module+el8.4.0+407+38733e5a
  • libserfRocky Linux:8all versions · fixed in 0:1.3.9-9.module+el8.7.0+1065+42200b2e
  • libserfRed Hat:rhel_eus:8.2::appstreamall versions · fixed in 0:1.3.9-9.module+el8.2.0+9887+08558108and 2 other packages
  • libserfRed Hat:rhel_eus:8.1::appstreamall versions · fixed in 0:1.3.9-9.module+el8.1.0+9889+0a9c19c4and 2 other packages
  • libserfRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:1.3.9-9.module+el8.3.0+6671+2675c974and 2 other packages
  • libserfAlmaLinux:8all versions · fixed in 1.3.9-9.module_el8.3.0+2053+ac338b6d
  • libserfAlmaLinux:8all versions · fixed in 1.3.9-9.module_el8.4.0+2266+ac338b6d
  • libserfAlmaLinux:8all versions · fixed in 1.3.9-9.module_el8.6.0+2912+eb1cdf5a

60 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-17525 Red Hat Product Security264 products fixed

    subversion: Remote unauthenticated denial of service in mod_authz_svn

  • RHSA-2021:0508 Red Hat Product Security88 products fixed

    Red Hat Security Advisory: subversion:1.10 security update

  • RHSA-2021:0507 Red Hat Product Security88 products fixed

    Red Hat Security Advisory: subversion:1.10 security update

  • RHSA-2021:0509 Red Hat Product Security88 products fixed

    Red Hat Security Advisory: subversion:1.10 security update

Full record on NVD

Fix

  1. Update Apache subversion to 1.14.1 · 1.10.7
  2. Vendor fix Red Hat Product Security RHSA-2021:0508 · 88 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, for the update to take effect, you must restart the httpd daemon, if you are using mod_dav_svn, and the svnserv…
  3. Workaround from the vendor Red Hat Product Security RHSA-2021:0508 · 88 productsAs per upstream "As a workaround, the use of in-repository authz rules files with the AuthzSVNReposRelativeAccessFile can be avoided by switching to an alternative configuration which fetches an authz rules file from the server's filesystem, rather than from an SVN repository."

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • CNAweakness (CWE)CWE-476known since 2026-10-23
  • NVDweakness (CWE)CWE-476read 2026-10-23
  • FIRST EPSSEPSS score40.1 %read 2026-11-02
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-03-17
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-w6m8-jhpf-wj94

Frequently asked questions

What is CVE-2020-17525?

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

Is CVE-2020-17525 actively exploited?

Active exploitation of CVE-2020-17525 has not been confirmed. Its EPSS score was 40.1% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-17525?

CVE-2020-17525 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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