What’s Vulnerable › Vulnerabilities

CVE-2016-2090

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-01-13 · updated 2026-06-17
• Weakness: CWE-119

Description

Off-by-one vulnerability in the fgetwln function in libbsd before 0.8.2 allows attackers to have unspecified impact via unknown vectors, which trigger a heap-based buffer overflow.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 18.04, 19.04
• Debian Linux: 8.0
• Fedoraproject Fedora: 24, 25
• Freedesktop Libbsd: before 0.8.2 — fixed in 0.8.2

How to fix

Upgrade to a fixed version: Freedesktop Libbsd 0.8.2. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2016/01/28/5
• https://blog.fuzzing-project.org/36-Heap-buffer-overflow-in-fgetwln-function-of-libbsd.html
• https://bugs.freedesktop.org/show_bug.cgi?id=93881
• https://cgit.freedesktop.org/libbsd/commit/?id=c8f0723d2b4520bdd6b9eb7c3e7976de726d7ff7
• https://lists.debian.org/debian-lts-announce/2019/12/msg00036.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7KJE5SPSX7HEKLZ34LUTZLXWPEL2K353/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DIQKQ42Z7553D46QY3IMIQKS52QTNIHY/
• https://security.gentoo.org/glsa/201607-13
• https://usn.ubuntu.com/4243-1/
• http://www.openwall.com/lists/oss-security/2016/01/28/5
• https://blog.fuzzing-project.org/36-Heap-buffer-overflow-in-fgetwln-function-of-libbsd.html
• https://bugs.freedesktop.org/show_bug.cgi?id=93881

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