How severe is CVE-2016-2167?

CVE-2016-2167 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2016-2167 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-2167?

CVE-2016-2167 primarily affects Apache Subversion. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-2167?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-2167 published?

CVE-2016-2167 was published on 2016-05-05 and last updated on 2026-06-17.

CVE-2016-2167

CVE-2016-2167 is a medium-severity vulnerability in Apache Subversion with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 4.9
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Apache Subversion
Published: 2016-05-05
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2016-2167?: 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.
How severe is CVE-2016-2167?: CVE-2016-2167 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2016-2167 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-2167?: CVE-2016-2167 primarily affects Apache Subversion. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-2167?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-2167 published?: CVE-2016-2167 was published on 2016-05-05 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:apache:subversion:*:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.9.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.9.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.9.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:subversion:1.9.3:*:*:*:*:*:*:*

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