CVE-2021-30184

Name: CVE-2021-30184
Creator: NVD / NIST
Published: 2021-04-07T12:15:16.437+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.77%

Last modified Jun 17, 2026

CVE-2021-30184 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. GNU Chess 6.2.7 allows attackers to execute arbitrary code via crafted PGN (Portable Game Notation) data. This is related to a buffer overflow in the use of a .tmp.epd temporary file in the cmd_pgnload and cmd_pgnreplay functions in frontend/cmd.cc.. EPSS estimates a 1.77% chance of exploitation in the next 30 days.

Description

GNU Chess 6.2.7 allows attackers to execute arbitrary code via crafted PGN (Portable Game Notation) data. This is related to a buffer overflow in the use of a .tmp.epd temporary file in the cmd_pgnload and cmd_pgnreplay functions in frontend/cmd.cc.

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

1.77%

75.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Gnu	Chess	6.2.7
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QC74RWMDLSQGV6Z3ZABNTPABB33S4YNF/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SOGPLC77ZL2FACSOE5MWDS3YH3RBNQAQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XXOTMUSBVUZNA3JMPG6BU37DQW2YOJWS/
https://lists.gnu.org/archive/html/bug-gnu-chess/2021-04/msg00000.htmlExploit, Mailing List, Patch, Vendor Advisory
https://lists.gnu.org/archive/html/bug-gnu-chess/2021-04/msg00001.htmlExploit, Mailing List, Vendor Advisory
https://security.gentoo.org/glsa/202107-28Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/01/msg00007.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QC74RWMDLSQGV6Z3ZABNTPABB33S4YNF/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SOGPLC77ZL2FACSOE5MWDS3YH3RBNQAQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XXOTMUSBVUZNA3JMPG6BU37DQW2YOJWS/
https://lists.gnu.org/archive/html/bug-gnu-chess/2021-04/msg00000.htmlExploit, Mailing List, Patch, Vendor Advisory
https://lists.gnu.org/archive/html/bug-gnu-chess/2021-04/msg00001.htmlExploit, Mailing List, Vendor Advisory
https://security.gentoo.org/glsa/202107-28Third Party Advisory

Timeline

Published: Apr 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30184?

How severe is CVE-2021-30184?

CVE-2021-30184 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.77% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30184?

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-2021-30184?

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

Scan your code now

Source: NVD / NIST