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CVE-2020-17525

38
FAUCET Score

CVE-2020-17525 describes a denial-of-service vulnerability in Subversion's mod_authz_svn module, affecting Apache Subversion and Debian Subversion when using in-repository authz rules with AuthzSVNReposRelativeAccessFile. An unauthenticated attacker can trigger a server crash by requesting a non-existent repository URL, leading to service disruption. This vulnerability has a CVSS score of 7.5 (High) due to its network attack vector, low complexity, and high impact on availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.9.0, < 1.10.7CPE matchmatch criteria
cpe:2.3:a:apache:subversion:*:*:*:*:*:*:*:*
>= 1.11.0, < 1.14.1CPE matchmatch criteria
cpe:2.3:a:apache:subversion:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
40.08%
Probability of exploitation in next 30 days
EPSS Percentile
98.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.4007 is in the 97th percentile among its peer group of 51,506 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

microsoftpatch availablevia msrc
Product: 19127-16823Fixed in: 1.14.0-4
microsoftpatch availablevia msrc
Product: cm1 subversion 1.14.0-4 on CBL Mariner 1.0Fixed in: 1.14.0-4
microsoftpatch availablevia msrc
Product: cbl2 subversion 1.14.0-4 on CBL Mariner 2.0Fixed in: 1.14.0-4
microsoftpatch availablevia msrc
Product: 19126-16820Fixed in: 1.14.0-4
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.1 Extended Update SupportFixed in: subversion:1.10-8010020210211092435.fa3af259
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: subversion:1.10-8030020210210135829.4035eae3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Extended Update SupportFixed in: subversion:1.10-8020020210211092052.f2093e77
View patch

Vendor Advisories (2)

microsoft2021-Mar/CVE-2020-17525Important

Remote unauthenticated denial-of-service in Subversion mod_authz_svn

Mar 9, 2021
redhatCVE-2020-17525Important

subversion: Remote unauthenticated denial of service in mod_authz_svn

Feb 10, 2021

References

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