CVE-2011-4354 json
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…
published 2012-01-27 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4285
- cvss
- 5.8
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.0%
- EPSS 3.0% chance of exploitation in 30 days, percentile 87%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- openssl Debian 14, Debian 13, Debian 12 0.9.8o-4squeeze3
debian advisories DEBIAN-CVE-2011-4354
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2011-4354 updated cvss 4.0
openssl: ECC private leak (disclosure of TLS server's private key)
-
Red Hat Enterprise Linux 4 openssl, openssl096b Red Hat Enterprise Linux 5 openssl, openssl097a Red Hat Enterprise Linux 6 openssl, openssl098e, openssl-perlnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
2.99% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
Classification
- Weakness
-
- CWE-310 Cryptographic Issues
- Technology feeds
References
-
debian.org
/security/2012/dsa-2390
vendor-advisory
- crypto.di.uminho.pt /CACE/CT-RSA2012-openssl-src.zip
- bugzilla.redhat.com /show_bug.cgi?id=757909
-
openwall.com
/lists/oss-security/2011/12/01/6
mailing-list
- eprint.iacr.org /2011/633
- rt.openssl.org /Ticket/Display.html?id=1593&user=guest&pass=guest
- cvs.openssl.org /filediff?f=openssl/crypto/bn/bn_nist.c&v1=1.14&v2=1.21
- marc.info /?t=119271238800004
Sources
- CVE List CVE-2011-4354
- NVD CVE-2011-4354
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.