CVE-2020-17525
Remote unauthenticated denial-of-service in Subversion mod_authz_svn
Reported by apache · Published March 17, 2021
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
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| subversion | Arch Linux | 1.14.1-1 |
| subversion | Alpine | 1.14.1-r0, 1.13.0-r3, 1.12.2-r2, 1.12.2-r1 |
| subversion | apache | 1.14.1, 1.10.7 |
| subversion | Ubuntu:Pro:18.04:LTS | 1.9.7-4ubuntu1.1 |
| subversion | Ubuntu:Pro:16.04:LTS | 1.9.3-2ubuntu1.3+esm1 |
| subversion | Ubuntu:18.04:LTS | 1.9.7-4ubuntu1.1 |
| Apache Subversion | Apache Software Foundation | 1.14.1 |
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Subversion | mod_authz_svn 1.10.7, mod_authz_svn |
| arch | subversion | 0 |
| alpine | subversion | 0, 0, 0 |
| Apache Software Foundation | Apache Subversion | 1.10.7, * |
| Apache Software Foundation | Apache Subversion |
Timeline
- Feb 10, 2021 CVE Published
- Apr 14, 2021 EPSS Score (30 in total, the first dated here)
- Sep 8, 2025 CVE Updated
- Mar 6, 2026 Distribution Patch (2 in total, the first dated here)
- Mar 6, 2026 Security Advisory (4 in total, the first dated here)
- Sep 3, 2026 Coalition ESS Score
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2020-17525
vulnetix vdb fixes CVE-2020-17525Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2020-17525/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart
References
- x_refsource_MISC
- [debian-lts-announce] 20210504 [SECURITY] [DLA 2646-1] subversion security update mailing-listx_refsource_MLIST