CVE-2025-46803Public exploit

Cross-user command injection via world-writable PTYs

Published May 26, 2025 · Updated May 27, 2025

Incorrect PTY permissions in GNU Screen 5.0.0 allow local users to inject terminal input into another user's Screen session. The configure.ac default sets newly allocated PTYs to mode 0622 instead of 0620, granting every local account write access to the terminal device. Exploitation requires another local user to run a default-built affected session; injected input can execute commands when its shell accepts it.

CVSS severity5.1
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect PTY permissions in GNU Screen 5.0.0 allow local users to inject terminal input into another user's Screen session. The configure.ac default sets newly allocated PTYs to mode 0622 instead of 0620, granting every local account write access to the terminal device. Exploitation requires another local user to run a default-built affected session; injected input can execute commands when its shell accepts it.

The record

CVE
CVE-2025-46803
Published
May 26, 2025
Updated
May 27, 2025
Vendor
The GnuPG Project
Product
GNU Screen
Classifications
CWE-276, T1059.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0 <=5.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The GnuPG Project · GNU Screenversion=5.0 <=5.0.0

Published CVSS scores

5.1SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
5.0SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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