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

Q: How do I fix CVE-2008-7128?

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

Q: Is CVE-2008-7128 being exploited?

CVE-2008-7128 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-2008-7128 affect?

CVE-2008-7128 affects xyssl. Severity is high (CVSS 7.5). The ssl_parse_client_key_exchange function in XySSL before 0.9 does not protect against certain Bleichenbacher attacks using chosen ciphertext, which allows remote attackers to recover keys via unspecified vectors.

This month

HIGH 7.5UPGRADE

CVE-2008-7128 is a high-severity flaw (CVSS 7.5) affecting xyssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The ssl_parse_client_key_exchange function in XySSL before 0.9 does not protect against certain Bleichenbacher attacks using chosen ciphertext, which allows remote attackers to recover keys via unspecified vectors.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-264
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-2008-7128?

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

Is CVE-2008-7128 being exploited?

CVE-2008-7128 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-2008-7128 affect?

CVE-2008-7128 affects xyssl. Severity is high (CVSS 7.5). The ssl_parse_client_key_exchange function in XySSL before 0.9 does not protect against certain Bleichenbacher attacks using chosen ciphertext, which allows remote attackers to recover keys via unspecified vectors.

How urgent is CVE-2008-7128?

Priority 44/100. High severity

Related CVEs

CVE-2008-7129 MEDIUM 5.0 UPGRADE XySSL before 0.9 allows remote attackers to cause a denial of service (infinite loop) via an X.509 certificate

References

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