CVE-2016-9243
Improper input validation in cryptography
7.5
HIGH
CVSS 3.1
EPSS 1.7%
Description
HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
How to fix CVE-2016-9243
To remediate CVE-2016-9243, upgrade the affected package to a fixed version below.
- Debian/python-cryptography—upgrade to 1.5.3-1 or later
- PyPI/cryptography—upgrade to 1.5.3 or later
- —upgrade to b924696b2e8731f39696584d12cceeb3aeb2d874 or later
Is CVE-2016-9243 being exploited?
Low — EPSS is 1.7%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 1.5.3-1
- from 0, < 1.5.3
- from 0, < b924696b2e8731f39696584d12cceeb3aeb2d874 | from 0, < 1.5.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |