CVE-2023-4692
A public proof of concept exists; no exploitation attested.
- Published2023-10-25
- WeaknessCWE-122 · CWE-787
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « 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
An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, leading to grub's heap metadata corruption. In some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result, arbitrary code execution and secure boot protection bypass may be achieved.
Timeline
dates in UTC- 2023-10-2518:17CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-4692?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-4692?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.0 | = 8.0 | no fix published | NVD |
| 9.0 | = 9.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.12 | < 2.12 | 2.12 | NVD |
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
- grub2-toolsAlmaLinux:9all versions · fixed in 1:2.06-77.el9.alma.1and 14 other packages
- grub2-toolsAlmaLinux:8all versions · fixed in 1:2.02-156.el8.alma.1and 17 other packages
Vendor advisories
grub2: Out-of-bounds write at fs/ntfs.c may lead to unsigned code execution
grub2 as a component of Red Hat Enterprise Linux 7 · grub2-common as a component of Red Hat Enterprise Linux 7 · grub2-efi as a component of Red Hat Enterprise Linux 7 · +19 more
Red Hat Security Advisory: grub2 security update
Red Hat Security Advisory: grub2 security update
Fix
- Vendor fix Red Hat Product Security RHSA-2024:3184 · 41 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
- No fix available, says the vendor Red Hat Product Security CVE-2023-4692 · 22 productsAffected
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- 2023-10-25
- Last Modified
- 2026-07-21
- NVD status
- Modified
Frequently asked questions
What is CVE-2023-4692?
Is CVE-2023-4692 actively exploited?
What is the CVSS score for CVE-2023-4692?
Running grub2? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.