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Public proof of conceptFix available

CVE-2023-24626

A public proof of concept exists; no exploitation attested.

  • Published2023-04-08
  • WeaknessCWE-732

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

socket.c in GNU Screen through 4.9.0, when installed setuid or setgid (the default on platforms such as Arch Linux and FreeBSD), allows local users to send a privileged SIGHUP signal to any PID, causing a denial of service or disruption of the target process.

Timeline

dates in UTC
  1. 2023-04-05Exploit-DB entryExploit-DB

Observed activity

isMalicious corpus · updated 2026-11-02 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-24626?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-24626?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Gnu screen
BranchAffectedFixed in
4.9≤ 4.9.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • screenUbuntu:Pro:18.04:LTSall versions · fixed in 4.6.2-1ubuntu1.1+esm1
  • screenUbuntu:Pro:16.04:LTSall versions · fixed in 4.3.1-2ubuntu0.1+esm1
  • screenUbuntu:Pro:14.04:LTSall versions · fixed in 4.1.0~20120320gitdb59704-9ubuntu0.1~esm3
  • screenUbuntu:24.04:LTSall versions · fixed in 4.9.1-1ubuntu1
  • screenUbuntu:22.04:LTSall versions · fixed in 4.9.0-1ubuntu0.1
  • screenUbuntu:20.04:LTSall versions · no fixed version listed
  • screenTuxCare:OracleLinux:7all versions · fixed in 4.1.0-0.27.20120314git3c2946.el7_9.tuxcare.els1
  • screenTuxCare:CentOS:7all versions · fixed in 4.1.0-0.27.20120314git3c2946.el7_9.tuxcare.els1

21 more package ranges on OSV.dev

Vendor advisories

  • CVE-2023-24626 Red Hat Product Security3 known affected

    screen: allows sending SIGHUP to arbitrary PIDs

    screen as a component of Red Hat Enterprise Linux 6 · screen as a component of Red Hat Enterprise Linux 7 · screen.src as a component of Red Hat Enterprise Linux 7

Full record on NVD

Fix

  1. No fix planned, says the vendor Red Hat Product Security CVE-2023-24626 · 3 productsOut of support scope

Advisories and patches

Detection

read 2026-11-01 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-51252
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Published
2023-04-08
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-wr4w-95gx-6cfr

Frequently asked questions

What is CVE-2023-24626?

socket.c in GNU Screen through 4.9.0, when installed setuid or setgid (the default on platforms such as Arch Linux and FreeBSD), allows local users to send a privileged SIGHUP signal to any PID, causing a denial of service or disruption of the target process.

Is CVE-2023-24626 actively exploited?

A proof-of-concept exploit exists for CVE-2023-24626, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2023-24626?

CVE-2023-24626 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.

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Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

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Sources for this record