Vulnerability record · CVE-2020-17525 · published 17 March 2021

CVE-2020-17525: Apache subversion null pointer dereference vulnerability

Apache · Subversion

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

7.5 CVSS 3.1 High EPSS 40% · top 1.4% CWE-476 · NULL pointer dereference

7.5CVSS 3.1 base score, v2 4.3

40%EPSS exploitation probability, 30 days

NoNot in CISA KEV

2Affected product versions listed by NVD

4References, 2 tagged exploit

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Subversion Apache

Debian Linux Debian

References

Link	Tags
https://lists.debian.org/debian-lts-announce/2021/05/msg00000.html	Mailing ListThird Party Advisory
https://subversion.apache.org/security/CVE-2020-17525-advisory.txt	ExploitPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00000.html	Mailing ListThird Party Advisory
https://subversion.apache.org/security/CVE-2020-17525-advisory.txt	ExploitPatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-17525), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.