CVE-2014-2899: wolfSSL CyaSSL before 2.9.4 allows remote attackers to cause a denial of service (NULL pointer dereference) vi

Q: How do I fix CVE-2014-2899?

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

Q: Is CVE-2014-2899 being exploited?

CVE-2014-2899 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-2014-2899 affect?

CVE-2014-2899 affects cyassl. Severity is medium (CVSS 5.0). wolfSSL CyaSSL before 2.9.4 allows remote attackers to cause a denial of service (NULL pointer dereference) via (1) a request for the peer certificate when a certificate parsing failure occurs or (2) a client_key_exchange message when the e

Q: How urgent is CVE-2014-2899?

Priority 37/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADE

CVE-2014-2899 is a medium-severity flaw (CVSS 5.0) 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 allows remote attackers to cause a denial of service (NULL pointer dereference) via (1) a request for the peer certificate when a certificate parsing failure occurs or (2) a client_key_exchange message when the ephemeral key is not found.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-20
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-2014-2899?

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

Is CVE-2014-2899 being exploited?

CVE-2014-2899 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-2014-2899 affect?

CVE-2014-2899 affects cyassl. Severity is medium (CVSS 5.0). wolfSSL CyaSSL before 2.9.4 allows remote attackers to cause a denial of service (NULL pointer dereference) via (1) a request for the peer certificate when a certificate parsing failure occurs or (2) a client_key_exchange message when the e

How urgent is CVE-2014-2899?

Priority 37/100. No elevated risk signals yet.

Software pages

wolfSSL vulnerabilities

Related CVEs

CVE-2014-2900 MEDIUM 5.8 UPGRADE wolfSSL CyaSSL before 2.9.4 does not properly validate X.509 certificates with unknown critical extensions, wh
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
CVE-2012-1558 MEDIUM 5.0 UPGRADE yaSSL CyaSSL before 2.0.8 allows remote attackers to cause a denial of service (NULL pointer dereference and a

References

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