CVE-2002-0420: Vulnerability in PureTLS before 0.9b2 related to injection attacks, which could possibly allow remote attacker

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HIGH 7.5DOWNGRADE

CVE-2002-0420 is a high-severity flaw (CVSS 7.5) affecting puretls. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in PureTLS before 0.9b2 related to injection attacks, which could possibly allow remote attackers to corrupt or hijack user sessions.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Published	2002-08-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: claymore systems inc

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

Am I affected?

Timeline

2002-08-12 04:00 UTCPublished CVE record published
2026-06-16 21:57 UTCUpdated Record last modified

claymore systems inc puretls DOWNGRADE

Affected: 0.9b1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9b1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.9b1 (Debian / Ubuntu)

apt-cache madison puretls sudo apt install puretls=<VERSION_BEFORE_0.9b1> sudo apt-mark hold puretls

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list puretls sudo dnf downgrade puretls-<VERSION_BEFORE_0.9b1> sudo dnf versionlock add puretls

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2002-0420?

puretls: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2002-0420 being exploited?

CVE-2002-0420 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-2002-0420 affect?

CVE-2002-0420 affects puretls. Severity is high (CVSS 7.5). Vulnerability in PureTLS before 0.9b2 related to injection attacks, which could possibly allow remote attackers to corrupt or hijack user sessions.

How urgent is CVE-2002-0420?

Priority 45/100. High severity

Related CVEs

CVE-2005-4839 MEDIUM 5.0 UPGRADE PureTLS before 0.9b5 does not clear optional Extensions and Algorithm.Parameters values before parsing, which

References

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