CVE-2008-7129: XySSL before 0.9 allows remote attackers to cause a denial of service (infinite loop) via an X.509 certificate

Q: How do I fix CVE-2008-7129?

xyssl: upgrade to newer than 0.8. Exact commands for each OS are on this page.

Q: Is CVE-2008-7129 being exploited?

CVE-2008-7129 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-2008-7129 affect?

CVE-2008-7129 affects xyssl. Severity is medium (CVSS 5.0). XySSL before 0.9 allows remote attackers to cause a denial of service (infinite loop) via an X.509 certificate that does not pass the RSA signature check during verification.

Q: How urgent is CVE-2008-7129?

Priority 32/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADE

CVE-2008-7129 is a medium-severity flaw (CVSS 5.0) affecting xyssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

XySSL before 0.9 allows remote attackers to cause a denial of service (infinite loop) via an X.509 certificate that does not pass the RSA signature check during verification.

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	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-399
Published	2009-08-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: xyssl

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

Am I affected?

Timeline

2009-08-31 10:30 UTCPublished CVE record published
2026-06-16 23:03 UTCUpdated Record last modified

xyssl xyssl UPGRADE

Affected: <= 0.8 · 0.1 · 0.2 · 0.3 · 0.4 · 0.5 · 0.6 · 0.7

Fixed in: newer than 0.8

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.8 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xyssl

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-2008-7129?

xyssl: upgrade to newer than 0.8. Exact commands for each OS are on this page.

Is CVE-2008-7129 being exploited?

CVE-2008-7129 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-2008-7129 affect?

CVE-2008-7129 affects xyssl. Severity is medium (CVSS 5.0). XySSL before 0.9 allows remote attackers to cause a denial of service (infinite loop) via an X.509 certificate that does not pass the RSA signature check during verification.

How urgent is CVE-2008-7129?

Priority 32/100. No elevated risk signals yet.

Related CVEs

CVE-2008-7128 HIGH 7.5 UPGRADE The ssl_parse_client_key_exchange function in XySSL before 0.9 does not protect against certain Bleichenbacher

References

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