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Fencer Intel
medium 5.8

CVE-2012-5662 json

x3270 before 3.3.12ga12 does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName…

published 2014-05-27 12 y ago modified 2026-06-16 4 mo ago also EUVD-2012-5545

cvss
5.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

x3270 before 3.3.12ga12 does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

Patch / fix

  • ibm-3270 Debian 14, Debian 13, Debian 12 3.3.14ga11-1

debian advisories DEBIAN-CVE-2012-5662

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-2012-5662 updated cvss 5.8

x3270: does not properly validate SSL certificates

  • Red Hat Enterprise Linux 7 x3270, x3270-x11, x3270-text
    affected: no fix available
  • Red Hat Enterprise Linux 5 x3270 Red Hat Enterprise Linux 6 x3270, x3270-x11, x3270-text
    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

0.62% chance of exploitation in the next 30 days, higher than 50% 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

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.