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CVE-2020-9366

29
FAUCET Score

CVE-2020-9366 is a critical buffer overflow vulnerability affecting GNU Screen versions prior to 4.8.0. This flaw allows specially crafted output or programs to corrupt memory, leading to crashes or potentially other severe impacts. With a CVSS score of 9.8, it is easily exploitable over the network with low complexity, enabling high confidentiality, integrity, and availability impacts. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the high severity warrants immediate patching.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.8.0CPE matchmatch criteria
cpe:2.3:a:gnu:screen:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.71%
Probability of exploitation in next 30 days
EPSS Percentile
84.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0271 is in the 75th percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2020-9366Moderate

screen: Out of bounds access when setting w_xtermosc after OSC 49

Feb 6, 2020

References

lists.gnu.org / archive/html/screen-devel/2020-02/msg00007.html
Mailing ListPatchRelease NotesVendor Advisory
security.gentoo.org / glsa/202003-62
Third Party Advisory
openwall.com / lists/oss-security/2020/02/06/3
Mailing ListPatchRelease Notes
openwall.com / lists/oss-security/2020/02/25/1
Mailing ListThird Party Advisory