CVE-2023-40549: fedoraproject fedora Out-of-bounds Read
CVSS: 6.2v3.1MediumModified
AliasesUBUNTU-CVE-2023-40549DEBIAN-CVE-2023-40549
Published 29-01-2024Last modified 20-11-2025
Vulnerability summary
CVE-2023-40549 is a medium (CVSS 6.2) Out-of-bounds Read vulnerability in fedoraproject fedora. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34% of scored vulnerabilities.
CVSS score
6.2/10
010
Medium · v3.1 (CVE.org)EPSS score
0.41%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 14 · Related 4Timeline
- 29-01-2024PublishedVulnerability first disclosed.
- 20-11-2025Last modifiedVulnerability information updated.
Description
An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and crashing Shim, resulting in a denial of service.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 6.2Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSources4 sources · 5.5–6.2
- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HDiffers
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HDiffers
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HDiffers
EPSS trend
Probability
0.41%
Chance of exploitation in the next 30 days
Percentile
34%
Versus all other CVEs
30-day change
0.00 pp
From 0.41% on 19-09-2026
19-09-202619-10-2026
EPSS score0.41%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Redhat2 products
- enterprise_linux8.0 | 9.0
- shim< 15.8
Ubuntu2 products
- shimAll versions (No fix recorded) | < 15.8-0ubuntu1
- shim-signedAll versions (No fix recorded) | < 1.40.10 | < 1.51.4 | < 1.58
Debian1 product
- shim< 15.8-1~deb12u1 | < 15.8-1
Fedoraproject1 product
- fedoraEOL39
4 vendors · 6 products
