CVE-2011-4354
crypto/bn/bn_nist.c in OpenSSL before 0.9.8h on 32-bit platforms, as used in stunnel and other products, in certain circumstances involving ECDH or ECDHE cipher suites, uses an incorrect modular reduction algorithm in its implementation of the P-256 and P-384 NIST elliptic curves, which allows remote attackers to obtain the private key of a TLS server via multiple handshake attempts.
Key facts
- CVSS score
- 5.8 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:N- Weakness (CWE)
- CWE-310
- EPSS score
- 3.0% (87th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2011-4285)
- Published
- January 27, 2012
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2011-4285 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- openssl / openssl
- openssl / openssl
- openssl / openssl
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and 9 more…
References
- http://crypto.di.uminho.pt/CACE/CT-RSA2012-openssl-src.zip
- http://cvs.openssl.org/filediff?f=openssl/crypto/bn/bn_nist.c&v1=1.14&v2=1.21
- http://eprint.iacr.org/2011/633
- http://marc.info/?t=119271238800004
- http://openwall.com/lists/oss-security/2011/12/01/6
- http://rt.openssl.org/Ticket/Display.html?id=1593&user=guest&pass=guest
- http://www.debian.org/security/2012/dsa-2390
- https://bugzilla.redhat.com/show_bug.cgi?id=757909
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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