CVE-2011-1945

Severity: low (CVSS 2.6 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2011-05-31 · updated 2026-06-16
Weakness: CWE-310

Description

The elliptic curve cryptography (ECC) subsystem in OpenSSL 1.0.0d and earlier, when the Elliptic Curve Digital Signature Algorithm (ECDSA) is used for the ECDHE_ECDSA cipher suite, does not properly implement curves over binary fields, which makes it easier for context-dependent attackers to determine private keys via a timing attack and a lattice calculation.

Affected products

OpenSSL: through 1.0.0d; 0.9.1c, 0.9.2b, 0.9.3, 0.9.3a, 0.9.4, 0.9.5 (+71)

References

http://eprint.iacr.org/2011/232.pdf
http://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html
http://secunia.com/advisories/44935
http://support.apple.com/kb/HT5784
http://www.debian.org/security/2011/dsa-2309
http://www.kb.cert.org/vuls/id/536044
http://www.kb.cert.org/vuls/id/MAPG-8FENZ3
http://www.mandriva.com/security/advisories?name=MDVSA-2011:136
http://www.mandriva.com/security/advisories?name=MDVSA-2011:137
https://hermes.opensuse.org/messages/8760466
https://hermes.opensuse.org/messages/8764170
http://eprint.iacr.org/2011/232.pdf

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