CVE-2016-2849

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-05-13 · updated 2026-06-17
Weakness: CWE-200

Description

Botan before 1.10.13 and 1.11.x before 1.11.29 do not use a constant-time algorithm to perform a modular inverse on the signature nonce k, which might allow remote attackers to obtain ECDSA secret keys via a timing side-channel attack.

Affected products

randombit botan: 1.10.12, 1.11.0, 1.11.1, 1.11.2, 1.11.3, 1.11.4 (+24)
Debian Linux: 8.0
Fedoraproject Fedora: 24

References

http://botan.randombit.net/security.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183669.html
http://marc.info/?l=botan-devel&m=146185420505943&w=2
http://www.debian.org/security/2016/dsa-3565
https://security.gentoo.org/glsa/201701-23
http://botan.randombit.net/security.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183669.html
http://marc.info/?l=botan-devel&m=146185420505943&w=2
http://www.debian.org/security/2016/dsa-3565
https://security.gentoo.org/glsa/201701-23

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