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Vulnerabilities

Vulnerability · CVE-2020-9366

A buffer overflow was found in the way GNU Screen before 4.8.0 treated the special escape OSC 49.

Published Feb 24, 2020 · catalog updated Oct 26, 2026 · A buffer overflow was

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2020-9366. EPSS is 2.71%. Act only if a listed version of A buffer overflow was is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A buffer overflow was).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.71%
Remediation
Advisory link
Affected products
Alpine:v3.10 screen · Alpine:v3.11 screen · Alpine:v3.12 screen · Alpine:v3.13 screen · Alpine:v3.14 screen · Alpine:v3.15 screen

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Alpine:v3.10 screen0 → 4.6.2-r1
  • Alpine:v3.11 screen0 → 4.7.0-r1
  • Alpine:v3.12 screen0 → 4.8.0-r0
  • Alpine:v3.13 screen0 → 4.8.0-r0
  • Alpine:v3.14 screen0 → 4.8.0-r0
  • Alpine:v3.15 screen0 → 4.8.0-r0
  • Alpine:v3.16 screen0 → 4.8.0-r0
  • Alpine:v3.17 screen0 → 4.8.0-r0
  • Alpine:v3.18 screen0 → 4.8.0-r0
  • Alpine:v3.19 screen0 → 4.8.0-r0
  • Alpine:v3.20 screen0 → 4.8.0-r0
  • Alpine:v3.21 screen0 → 4.8.0-r0

How to fix CVE-2020-9366

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2020-9366. EPSS is 2.71%. Act only if a listed version of A buffer overflow was is installed.

Which versions are affected?

Compare what you have installed with 0 → 4.6.2-r1, 0 → 4.7.0-r1, 0 → 4.8.0-r0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 2.71%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 24, 2020 · Trivy Vulnerability DB

    Detected

    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.

  2. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    screen fixed in 4.6.2-r1; screen fixed in 4.7.0-r1; screen fixed in 4.8.0-r0; screen fixed in 4.8.0-r0

  3. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    screen fixed in 4.6.2-r1

  4. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    screen fixed in 4.7.0-r1

  5. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    screen fixed in 4.8.0-r0

  6. Oct 26, 2026 · Trivy Vulnerability DB

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2020-9366

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-9366

    30-day exploitation probability 2.71%

    first.org
  • OpenSSF OSV / OSV ScannerPackage advisoryALPINE-CVE-2020-9366
    osv.dev
  • Trivy Vulnerability DBPackage advisoryALPINE-CVE-2020-9366

    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.

    osv.dev

References

Freshness

Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 4, 2026
  • OpenSSF OSV / OSV ScannerOct 26, 2026
  • CVE.orgOct 26, 2026
  • Trivy Vulnerability DBOct 26, 2026