CVE-2009-0127: M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify,

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MEDIUM 5.0WATCHLISTMITIGATE

CVE-2009-0127 is a medium-severity flaw (CVSS 5.0) affecting m2crypto. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify, DSA_do_verify, and ECDSA_do_verify functions, which might allow remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077. NOTE: a Linux vendor disputes the relevance of this report to the M2Crypto product because "these functions are not used anywhere in m2

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	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-287
Published	2009-01-15
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: heikkitoivonen

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

heikkitoivonen m2crypto MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy m2crypto || rpm -q m2crypto || m2crypto --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2009-0127?

m2crypto: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2009-0127 being exploited?

CVE-2009-0127 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-2009-0127 affect?

CVE-2009-0127 affects m2crypto. Severity is medium (CVSS 5.0). M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify, DSA_do_verify, and ECDSA_do_verify functions, which might allow remote attackers to bypass validation of the certificate chain via

How urgent is CVE-2009-0127?

Priority 46/100. Public exploit reference; On your watchlist

Software pages

OpenSSL vulnerabilities

Related CVEs

CVE-2020-25657 MEDIUM 5.9 MITIGATE DOWNGRADE A flaw was found in all released versions of m2crypto, where they are vulnerable to Bleichenbacher timing atta

References

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