CVE-2009-0124: The tqsl_verifyDataBlock function in openssl_cert.cpp in American Radio Relay League (ARRL) tqsllib 2.0 does n

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MEDIUM 5.0WATCHLISTDOWNGRADE

CVE-2009-0124 is a medium-severity flaw (CVSS 5.0) affecting tqsllib. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The tqsl_verifyDataBlock function in openssl_cert.cpp in American Radio Relay League (ARRL) tqsllib 2.0 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.

Why this priority

Public exploit reference
On your watchlist

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-287
Published	2009-01-15
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: arrl

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

Am I affected?

Timeline

2009-01-15 17:30 UTCPublished CVE record published
2026-06-16 23:04 UTCUpdated Record last modified

arrl tqsllib DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison tqsllib sudo apt install tqsllib=<VERSION_BEFORE_2.0> sudo apt-mark hold tqsllib

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

dnf --showduplicates list tqsllib sudo dnf downgrade tqsllib-<VERSION_BEFORE_2.0> sudo dnf versionlock add tqsllib

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-2009-0124?

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

Is CVE-2009-0124 being exploited?

CVE-2009-0124 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-2009-0124 affect?

CVE-2009-0124 affects tqsllib. Severity is medium (CVSS 5.0). The tqsl_verifyDataBlock function in openssl_cert.cpp in American Radio Relay League (ARRL) tqsllib 2.0 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation o

How urgent is CVE-2009-0124?

Priority 45/100. Public exploit reference; On your watchlist

Software pages

OpenSSL vulnerabilities

References

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