CVE-2020-9366

9.8 criticalEPSS 2.7%

Critical (9.8) in gnu screen. EPSS 2.7% chance of exploitation in the next 30 days.

A buffer overflow was found in the way GNU Screen before 4.8.0 treated the special escape OSC 49. Specially crafted output, or a special program, could corrupt memory and crash Screen or possibly have unspecified other impact.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 2.7% chance of exploitation in the next 30 days; higher than 85% of CVEs (scores of 2026-10-31)
CWE: CWE-787
Published: 2020-02-24
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

gnu:screen

References

http://www.openwall.com/lists/oss-security/2020/02/25/1
https://lists.gnu.org/archive/html/screen-devel/2020-02/msg00007.html
https://security.gentoo.org/glsa/202003-62
https://www.openwall.com/lists/oss-security/2020/02/06/3
http://www.openwall.com/lists/oss-security/2020/02/25/1

Check your stack JSON