CVE-2020-9366

Name: CVE-2020-9366
Creator: NVD / NIST
Published: 2020-02-24T17:15:15.967+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.64%

Last modified Jun 17, 2026

CVE-2020-9366 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 2.64% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.64%

83.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Gnu	Screen	< 4.8.0

References

http://www.openwall.com/lists/oss-security/2020/02/25/1Mailing List, Third Party Advisory
https://lists.gnu.org/archive/html/screen-devel/2020-02/msg00007.htmlMailing List, Patch, Release Notes, Vendor Advisory
https://security.gentoo.org/glsa/202003-62Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/02/06/3Mailing List, Patch, Release Notes
http://www.openwall.com/lists/oss-security/2020/02/25/1Mailing List, Third Party Advisory
https://lists.gnu.org/archive/html/screen-devel/2020-02/msg00007.htmlMailing List, Patch, Release Notes, Vendor Advisory
https://security.gentoo.org/glsa/202003-62Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/02/06/3Mailing List, Patch, Release Notes

Timeline

Published: Feb 24, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-9366?

How severe is CVE-2020-9366?

CVE-2020-9366 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.64% probability of exploitation in the next 30 days.

How do I fix CVE-2020-9366?

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-2020-9366?

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

Scan your code now

Source: NVD / NIST