What is CVE-2020-12723?

CVE-2020-12723 is a high-severity software vulnerability (Buffer overflow) with a CVSS score of 7.5. regcomp.c in Perl before 5.30.3 allows a buffer overflow via a crafted regular expression because of recursive S_study_chunk calls.

Is CVE-2020-12723 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 6%.

What products does CVE-2020-12723 affect?

Tracked products affected include Perl. Check the version you run to see whether it is affected.

How do I fix CVE-2020-12723?

Apply the vendor fix promptly. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2020-12723

HIGH severity · CVSS 7.5 · Buffer overflow

7.5CVSS HIGH

Summary

regcomp.c in Perl before 5.30.3 allows a buffer overflow via a crafted regular expression because of recursive S_study_chunk calls.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)6%

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Perl

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://github.com/Perl/perl5/compare/v5.30.2...v5.30.3 ↗

Additional information

NVD record
https://github.com/Perl/perl5/compare/v5.30.2...v5.30.3Patch
https://github.com/perl/perl5/commit/66bbb51b93253a3f87d11c2695cfb7bdb782184aPatch
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00044.htmlAdvisory
https://github.com/Perl/perl5/blob/blead/pod/perl5303delta.podAdvisory
https://github.com/Perl/perl5/issues/16947Advisory
https://github.com/Perl/perl5/issues/17743Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IN3TTBO5KSGWE5IRIKDJ5JSQRH7ANNXE/
https://security.gentoo.org/glsa/202006-03Advisory