Vulnerability in OpenSSL
CVE-2024-13176
Issue summary: A timing side-channel which could potentially allow recovering the private key exists in the ECDSA signature computation. Impact summary: A timing side-channel in ECDSA signature computations could allow recovering the private key by an attacker. However, measuring the timing would require either local access to the signing application or a very fast network connection with low latency. There is a timing signal of around 300 nanoseconds when the top word of the inverted ECDSA nonce value is zero. This can happen with significant probability only for some of the supported elliptic curves. In particular the NIST P-521 curve is affected. To be able to measure this leak, the attacker process must either be located in the same physical computer or must have a very fast network connection with low latency. For that reason the severity of this vulnerability is Low. The FIPS modules in 3.4, 3.3, 3.2, 3.1 and 3.0 are affected by this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.006 (47.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- OpenSSL — versions 3.4.0, 3.3.0, 3.2.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- openssl-library.org/news/secadv/20250120.txt (vendor-advisory)
- github.com/openssl/openssl/commit/77c608f4c8857e63e98e66444e2e761c9627916f (patch)
- github.com/openssl/openssl/commit/392dcb336405a0c94486aa6655057f59fd3a0902 (patch)
- github.com/openssl/openssl/commit/4b1cb94a734a7d4ec363ac0a215a25c181e11f65 (patch)
- github.com/openssl/openssl/commit/2af62e74fb59bc469506bc37eb2990ea408d9467 (patch)
- github.com/openssl/openssl/commit/07272b05b04836a762b4baa874958af51d513844 (patch)
- github.openssl.org/openssl/extended-releases/commit/a2639000db19878d5d89586ae7b… (patch)
- github.openssl.org/openssl/extended-releases/commit/0d5fd1ab987f7571e2c955d8d8b… (patch)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2024-13176?
- CVE-2024-13176 is a medium-severity vulnerability in OpenSSL, classified under CWE-385. CVSS score: 4.1/10. Published 2025-01-20.
- How severe is CVE-2024-13176?
- Medium severity. CVSS v3 base score is 4.1 out of 10.
- Is CVE-2024-13176 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.