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Fencer Intel
medium 4.0

CVE-2011-5095 json

The Diffie-Hellman key-exchange implementation in OpenSSL 0.9.8, when FIPS mode is enabled, does not properly validate a public parameter,…

published 2012-06-20 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4995

cvss
4.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

The Diffie-Hellman key-exchange implementation in OpenSSL 0.9.8, when FIPS mode is enabled, does not properly validate a public parameter, which makes it easier for man-in-the-middle attackers to obtain the shared secret key by modifying network traffic, a related issue to CVE-2011-1923.

Patch / fix

  • openssl Debian 14, Debian 13, Debian 12 0.9.8a-1

debian advisories DEBIAN-CVE-2011-5095

  • libqt4 SLES 12 SP1, SLES 12, SLED 12 SP1 +7 more 4.8.6-7.1
  • libqt4-sql-plugins SLES 12 SP1, SLES 12, SLED 12 SP1 +7 more 4.8.6-7.1

suse advisories SUSE-SU-403SUSE-SU-403 Forbidden-1

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-2011-5095 updated cvss 4.0

openssl: weak public value accepted during Diffie Hellman key exchange

  • Red Hat Enterprise Linux 5 openssl097a Red Hat Enterprise Linux 6 openssl098e
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 5 openssl Red Hat Enterprise Linux 6 openssl, openssl-perl
    not 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

2.06% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.0 AV:N/AC:H/Au:N/C:P/I:P/A:N

Classification

Weakness
Technology feeds

References

Sources

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.