4.8

CVE-2025-52497: arm mbed_tls Off-by-one Error

CVSS: 4.8v3.1MediumModified
AliasesALPINE-CVE-2025-52497UBUNTU-CVE-2025-52497DEBIAN-CVE-2025-52497
Published 04-07-2025Last modified 03-11-2025
Open JSON

Vulnerability summary

CVE-2025-52497 is a medium (CVSS 4.8) Off-by-one Error vulnerability in arm mbed_tls. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24.8% of scored vulnerabilities.

Overall risk
19/100
0100
Low · default modelHow is this calculated?
CVSS score
4.8/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.33%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 2
DLA-4274-1OPENSUSE-SU-2026:21144-1USN-8123-1

Timeline

  1. 04-07-2025
    PublishedVulnerability first disclosed.
  2. 03-11-2025
    Last modifiedVulnerability information updated.

Description

Mbed TLS before 3.6.4 has a PEM parsing one-byte heap-based buffer underflow, in mbedtls_pem_read_buffer and two mbedtls_pk_parse functions, via untrusted PEM input.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

25%

Versus all other CVEs

30-day change

+0.05 pp

From 0.28% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.33%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Alpine1 product
  • mbedtls< 3.6.4-r0
Arm1 product
Debian1 product
  • mbedtlsAll versions (No fix recorded) | < 3.6.4-1
Mbed1 product
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

5 vendors · 5 products

References

7 links