A buffer overflow was found in the way GNU Screen before 4.8.0 treated the special escape…
Priority MEDIUM 47CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.02706 86th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 3 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2020-9366
- 2026-10-03 Alias added: GHSA-fcx3-q2fc-3hrw
References
More GNU Screen vulnerabilities
- TI-2023-10233 socket.c in GNU Screen through 4.9.0, when installed setuid or setgid (the default on… CVSS 3.1MEDIUM 6.5
- TI-2021-08542 encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of… CVSS 3.1CRITICAL 9.8
- TI-2003-00878 Integer signedness error in ansi.c for GNU screen 4.0.1 and earlier, and 3.9.15 and… CVSS 2.0HIGH 10.0
- TI-2017-03620 GNU screen before 4.5.1 allows local users to modify arbitrary files and consequently… CVSS 3.0HIGH 7.8
- TI-2007-02947 GNU screen 4.0.3 allows local users to unlock the screen via a CTRL-C sequence at the… CVSS 2.0HIGH 7.2
- TI-2002-01524 Buffer overflow in the Braille module for GNU screen 3.9.11, when HAVE_BRAILLE is… CVSS 2.0MEDIUM 4.6
Sources
- CVE-2020-9366 · CVE Program
- CVE-2020-9366 · NVD
- FIRST EPSS
- GHSA-fcx3-q2fc-3hrw · GitHub Advisory Database · CC BY 4.0
- CVE-2020-9366 · Red Hat security data · CC BY 4.0
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