CVE-2012-5662: x3270 before 3.3.12ga12 does not verify that the server hostname matches a domain name in the subject's Common

Q: How do I fix CVE-2012-5662?

x3270: upgrade to newer than 3.3.12. Exact commands for each OS are on this page.

Q: Is CVE-2012-5662 being exploited?

CVE-2012-5662 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2012-5662 affect?

CVE-2012-5662 affects x3270. Severity is medium (CVSS 5.8). 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

Q: How urgent is CVE-2012-5662?

Priority 33/100. No elevated risk signals yet.

Routine

MEDIUM 5.8UPGRADE

CVE-2012-5662 is a medium-severity flaw (CVSS 5.8) affecting x3270. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.8 (Medium)
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-310
Published	2014-05-27
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: paul mattes

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2014-05-27 14:55 UTCPublished CVE record published
2026-06-16 23:47 UTCUpdated Record last modified

paul mattes x3270 UPGRADE

Affected: <= 3.3.12 · 3.3.5 · 3.3.6 · 3.3.7 · 3.3.8 · 3.3.8 p1 · 3.3.8 p2 · 3.3.8 p3

Fixed in: newer than 3.3.12

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy x3270 || rpm -q x3270 || x3270 --version

2. UPGRADE to newer than 3.3.12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade x3270

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade x3270

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2012-5662?

x3270: upgrade to newer than 3.3.12. Exact commands for each OS are on this page.

Is CVE-2012-5662 being exploited?

CVE-2012-5662 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2012-5662 affect?

CVE-2012-5662 affects x3270. Severity is medium (CVSS 5.8). 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

How urgent is CVE-2012-5662?

Priority 33/100. No elevated risk signals yet.

References

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