CVE-2011-4354

Name: CVE-2011-4354
Creator: NVD / NIST
Published: 2012-01-27T00:55:01.033+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.04%

Last modified Jun 16, 2026

CVE-2011-4354 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 4.04% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

4.04%

89.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-310

Affected Software

Vendor	Product	Versions
Openssl	Openssl	<= 0.9.8g
Openssl	Openssl	0.9.1c
Openssl	Openssl	0.9.2b
Openssl	Openssl	0.9.3
Openssl	Openssl	0.9.3a
Openssl	Openssl	0.9.4
Openssl	Openssl	0.9.5
Openssl	Openssl	0.9.5a
Openssl	Openssl	0.9.6
Openssl	Openssl	0.9.6a
Openssl	Openssl	0.9.6b
Openssl	Openssl	0.9.6c
Openssl	Openssl	0.9.6d
Openssl	Openssl	0.9.6e
Openssl	Openssl	0.9.6f
Openssl	Openssl	0.9.6g
Openssl	Openssl	0.9.6h
Openssl	Openssl	0.9.6i
Openssl	Openssl	0.9.6j
Openssl	Openssl	0.9.6k
Openssl	Openssl	0.9.6l
Openssl	Openssl	0.9.6m
Openssl	Openssl	0.9.7
Openssl	Openssl	0.9.7a
Openssl	Openssl	0.9.7b
Openssl	Openssl	0.9.7c
Openssl	Openssl	0.9.7d
Openssl	Openssl	0.9.7e
Openssl	Openssl	0.9.7f
Openssl	Openssl	0.9.7g
Openssl	Openssl	0.9.7h
Openssl	Openssl	0.9.7i
Openssl	Openssl	0.9.7j
Openssl	Openssl	0.9.7k
Openssl	Openssl	0.9.7l
Openssl	Openssl	0.9.7m
Openssl	Openssl	0.9.8
Openssl	Openssl	0.9.8a
Openssl	Openssl	0.9.8b
Openssl	Openssl	0.9.8c
Openssl	Openssl	0.9.8d
Openssl	Openssl	0.9.8e
Openssl	Openssl	0.9.8f

References

Timeline

Published: Jan 27, 2012
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2011-4354?

How severe is CVE-2011-4354?

Severity scoring for CVE-2011-4354 is pending analysis. The EPSS model estimates a 4.04% probability of exploitation in the next 30 days.

How do I fix CVE-2011-4354?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2011-4354?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST