CVE-2020-11958

Name: CVE-2020-11958
Creator: NVD / NIST
Published: 2020-04-21T01:15:11.57+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.66%

Last modified Jun 17, 2026

CVE-2020-11958 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. re2c 1.3 has a heap-based buffer overflow in Scanner::fill in parse/scanner.cc via a long lexeme.. EPSS estimates a 1.66% chance of exploitation in the next 30 days.

Description

re2c 1.3 has a heap-based buffer overflow in Scanner::fill in parse/scanner.cc via a long lexeme.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

1.66%

73.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Re2c	Re2c	1.3
Canonical	Ubuntu Linux	19.10
Canonical	Ubuntu Linux	20.04

References

http://www.openwall.com/lists/oss-security/2020/04/21/1Mailing List, Third Party Advisory
https://blogs.gentoo.org/ago/2020/04/19/re2c-heap-overflow-in-scannerfill-scanner-cc/Third Party Advisory
https://github.com/skvadrik/re2c/commit/c4603ba5ce229db83a2a4fb93e6d4b4e3ec3776aPatch, Third Party Advisory
https://security.gentoo.org/glsa/202007-28Third Party Advisory
https://usn.ubuntu.com/4338-1/Third Party Advisory
https://usn.ubuntu.com/4338-2/Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/04/19/1Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/04/21/1Mailing List, Third Party Advisory
https://blogs.gentoo.org/ago/2020/04/19/re2c-heap-overflow-in-scannerfill-scanner-cc/Third Party Advisory
https://github.com/skvadrik/re2c/commit/c4603ba5ce229db83a2a4fb93e6d4b4e3ec3776aPatch, Third Party Advisory
https://security.gentoo.org/glsa/202007-28Third Party Advisory
https://usn.ubuntu.com/4338-1/Third Party Advisory
https://usn.ubuntu.com/4338-2/Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/04/19/1Mailing List, Third Party Advisory

Timeline

Published: Apr 21, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-11958?

re2c 1.3 has a heap-based buffer overflow in Scanner::fill in parse/scanner.cc via a long lexeme.

How severe is CVE-2020-11958?

CVE-2020-11958 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.66% probability of exploitation in the next 30 days.

How do I fix CVE-2020-11958?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-11958?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST