CVE-2012-1558: yaSSL CyaSSL before 2.0.8 allows remote attackers to cause a denial of service (NULL pointer dereference and a

Q: How do I fix CVE-2012-1558?

cyassl: upgrade to newer than 2.0.6. Exact commands for each OS are on this page.

Q: Is CVE-2012-1558 being exploited?

CVE-2012-1558 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-2012-1558 affect?

CVE-2012-1558 affects cyassl. Severity is medium (CVSS 5.0). yaSSL CyaSSL before 2.0.8 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted X.509 certificate.

Q: How urgent is CVE-2012-1558?

Priority 35/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADE

CVE-2012-1558 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.

yaSSL CyaSSL before 2.0.8 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted X.509 certificate.

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	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-399
Published	2012-03-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: yassl

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

Am I affected?

Timeline

2012-03-12 19:55 UTCPublished CVE record published
2026-06-16 23:39 UTCUpdated Record last modified

yassl cyassl UPGRADE

Affected: <= 2.0.6 · 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 2.0.6

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 2.0.6 (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-2012-1558?

cyassl: upgrade to newer than 2.0.6. Exact commands for each OS are on this page.

Is CVE-2012-1558 being exploited?

CVE-2012-1558 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-2012-1558 affect?

CVE-2012-1558 affects cyassl. Severity is medium (CVSS 5.0). yaSSL CyaSSL before 2.0.8 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted X.509 certificate.

How urgent is CVE-2012-1558?

Priority 35/100. No elevated risk signals yet.

Related CVEs

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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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