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Public proof of concept

CVE-2025-0690

A public proof of concept exists; no exploitation attested.

  • Published2025-02-24
  • WeaknessCWE-787

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

The read command is used to read the keyboard input from the user, while reads it keeps the input length in a 32-bit integer value which is further used to reallocate the line buffer to accept the next character. During this process, with a line big enough it's possible to make this variable to overflow leading to a out-of-bounds write in the heap based buffer. This flaw may be leveraged to corrupt grub's internal critical data and secure boot bypass is not discarded as consequence.

Timeline

dates in UTC
  1. 2025-02-2408:15CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2025-0690?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2025-0690?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

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

  • grub2-toolsAlmaLinux:9all versions · fixed in 1:2.06-104.el9_6.alma.1and 14 other packages

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-10-23 19:24 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedkaleth4/CVE-2025-0690
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2025-02-24
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.16.1read 2026-10-23
  • CNAweakness (CWE)CWE-787read 2026-10-23
  • FIRST EPSSEPSS score0.7 %2026-10-22
  • PoC-in-GitHubproof of concept1read 2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Published
2025-02-24
Last Modified
2026-10-21
NVD status
Deferred

Frequently asked questions

What is CVE-2025-0690?

The read command is used to read the keyboard input from the user, while reads it keeps the input length in a 32-bit integer value which is further used to reallocate the line buffer to accept the next character. During this process, with a line big enough it's possible to make this variable to overflow leading to a out-of-bounds write in the heap based buffer. This flaw may be leveraged to corrupt grub's internal critical data and secure boot bypass is not discarded as consequence.

Is CVE-2025-0690 actively exploited?

Active exploitation of CVE-2025-0690 has not been confirmed. Its EPSS score was 0.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-0690?

CVE-2025-0690 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.

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