The canonicalize_username function in svnserve/cyrus_auth.c in Apache Subversion before…
Priority MEDIUM 40CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-284.
Summary
The canonicalize_username function in svnserve/cyrus_auth.c in Apache Subversion before 1.8.16 and 1.9.x before 1.9.4, when Cyrus SASL authentication is used, allows remote attackers to authenticate and bypass intended access restrictions via a realm string that is a prefix of an expected repository realm string.
Why it matters now
EPSS 0.06814 94th percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:subversion:*:*:*:*:*:*:*:* | up to 1.8.15 | Vulnerable | Apache |
| cpe:2.3:a:apache:subversion:1.9.0:*:*:*:*:*:*:* | 1.9.0 | Vulnerable | Apache |
| cpe:2.3:a:apache:subversion:1.9.1:*:*:*:*:*:*:* | 1.9.1 | Vulnerable | Apache |
| cpe:2.3:a:apache:subversion:1.9.2:*:*:*:*:*:*:* | 1.9.2 | Vulnerable | Apache |
| cpe:2.3:a:apache:subversion:1.9.3:*:*:*:*:*:*:* | 1.9.3 | Vulnerable | Apache |
- cpe:2.3:a:apache:subversion:*:*:*:*:*:*:*:* Versions up to 1.8.15 Vulnerable ·Apache
- cpe:2.3:a:apache:subversion:1.9.0:*:*:*:*:*:*:* Versions 1.9.0 Vulnerable ·Apache
- cpe:2.3:a:apache:subversion:1.9.1:*:*:*:*:*:*:* Versions 1.9.1 Vulnerable ·Apache
- cpe:2.3:a:apache:subversion:1.9.2:*:*:*:*:*:*:* Versions 1.9.2 Vulnerable ·Apache
- cpe:2.3:a:apache:subversion:1.9.3:*:*:*:*:*:*:* Versions 1.9.3 Vulnerable ·Apache
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2016-2167
- 2026-10-03 Alias added: GHSA-4j43-22vc-mh3h
References
Advisory 7
More Apache Subversion vulnerabilities
- 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-2020-13273 Remote unauthenticated denial-of-service in Subversion mod_authz_svn 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
Sources
- CVE-2016-2167 · CVE Program
- CVE-2016-2167 · NVD
- FIRST EPSS
- GHSA-4j43-22vc-mh3h · GitHub Advisory Database · CC BY 4.0
- CVE-2016-2167 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences