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Status published
High
CVE-2016-9243
HKDF in cryptography before 1.5.2 returns an empty byte-string if...
Vulnerability Description
HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
THREAT MONITOR
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/
- http://www.ubuntu.com/usn/USN-3138-1
- https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/
- http://www.securityfocus.com/bid/94216
- http://www.openwall.com/lists/oss-security/2016/11/09/2
- https://cryptography.io/en/latest/changelog
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/
- https://github.com/pyca/cryptography/issues/3211
Affected Vendor
cryptography.io
View all reports →Affected Software
cryptography, fedora, ubuntu linux
Vulnerable Versions:
0, 23, 24, 25, 16.04, 16.10
Timeline
Official Publish:
March 27th, 2017
Last Modified:
August 6th, 2024
Added to House:
July 20th, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.