CVE-2014-2900: wolfSSL CyaSSL before 2.9.4 does not properly validate X.509 certificates with unknown critical extensions, wh

Q: How do I fix CVE-2014-2900?

cyassl: upgrade to newer than 2.9.0. Exact commands for each OS are on this page.

Q: Is CVE-2014-2900 being exploited?

CVE-2014-2900 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-2014-2900 affect?

CVE-2014-2900 affects cyassl. Severity is medium (CVSS 5.8). wolfSSL CyaSSL before 2.9.4 does not properly validate X.509 certificates with unknown critical extensions, which allows man-in-the-middle attackers to spoof servers via crafted X.509 certificate.

Q: How urgent is CVE-2014-2900?

Priority 36/100. No elevated risk signals yet.

Routine

MEDIUM 5.8UPGRADE

CVE-2014-2900 is a medium-severity flaw (CVSS 5.8) affecting cyassl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

wolfSSL CyaSSL before 2.9.4 does not properly validate X.509 certificates with unknown critical extensions, which allows man-in-the-middle attackers to spoof servers via crafted X.509 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	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-310
Published	2014-04-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yassl

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2014-04-22 14:23 UTCPublished CVE record published
2026-06-17 00:07 UTCUpdated Record last modified

yassl cyassl UPGRADE

Affected: <= 2.9.0 · 0.2.0 · 0.3.0 · 0.4.0 · 0.5.0 · 0.5.5 · 0.6.0 · 0.6.2

Fixed in: newer than 2.9.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.9.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cyassl

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-2014-2900?

cyassl: upgrade to newer than 2.9.0. Exact commands for each OS are on this page.

Is CVE-2014-2900 being exploited?

CVE-2014-2900 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-2014-2900 affect?

CVE-2014-2900 affects cyassl. Severity is medium (CVSS 5.8). wolfSSL CyaSSL before 2.9.4 does not properly validate X.509 certificates with unknown critical extensions, which allows man-in-the-middle attackers to spoof servers via crafted X.509 certificate.

How urgent is CVE-2014-2900?

Priority 36/100. No elevated risk signals yet.

Software pages

wolfSSL vulnerabilities

Related CVEs

CVE-2014-2899 MEDIUM 5.0 UPGRADE wolfSSL CyaSSL before 2.9.4 allows remote attackers to cause a denial of service (NULL pointer dereference) vi
CVE-2013-1623 MEDIUM 4.3 UPGRADE The TLS and DTLS implementations in wolfSSL CyaSSL before 2.5.0 do not properly consider timing side-channel a

References

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