CVE-2025-27810: arm mbed_tls Use of Uninitialized Resource
CVSS: 5.4v3.1MediumAnalyzed
AliasesALPINE-CVE-2025-27810UBUNTU-CVE-2025-27810DEBIAN-CVE-2025-27810
Published 25-03-2025Last modified 25-03-2025
Vulnerability summary
CVE-2025-27810 is a medium (CVSS 5.4) Use of Uninitialized Resource vulnerability in arm mbed_tls. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 21% of scored vulnerabilities.
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)EPSS score
0.30%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 4 · Related 4Timeline
- 25-03-2025PublishedVulnerability first disclosed.
- 25-03-2025Last modifiedVulnerability information updated.
Description
Mbed TLS before 2.28.10 and 3.x before 3.6.3, in some cases of failed memory allocation or hardware errors, uses uninitialized stack memory to compose the TLS Finished message, potentially leading to authentication bypasses such as replays.
CVSS metrics
5 scores · 5 sources · 1 versionMedium 5.4Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:NSources5 sources · 4.8–5.4
- OSV · AlpineEcosystem advisory · calculated4.8MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NDiffers
- OSV · UbuntuEcosystem advisory · calculated4.8MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NDiffers
- OSV · DebianEcosystem advisory · calculated4.8MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NDiffers
- NVDNIST4.8MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NDiffers
EPSS trend
Probability
0.30%
Chance of exploitation in the next 30 days
Percentile
21%
Versus all other CVEs
30-day change
+0.01 pp
From 0.29% on 19-09-2026
19-09-202619-10-2026
EPSS score0.30%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- mbedtls< 2.28.10-r0 | < 3.6.3-r0
Arm1 product
- mbed_tls< 2.28.10
Debian1 product
- mbedtlsAll versions (No fix recorded) | < 3.6.3-1
Mbed1 product
- mbedtls< 2.28.10 | ≥ 3.0.0, < 3.6.3
Trustedfirmware1 product
- mbed_tls≥ 3.0.0, < 3.6.3
Ubuntu1 product
- mbedtlsAll versions (No fix recorded) | < 2.8.0-1ubuntu0.1~esm1 | < 2.16.4-1ubuntu2+esm1 | < 2.28.0-1ubuntu0.1~esm1 | < 2.28.8-1ubuntu0.1~esm1
6 vendors · 6 products
References
7 links- github.com/Mbed-TLS/mbedtls/releasesRelease Notes
