Vulnerability in Mbed Mbedtls
CVE-2025-49087
In Mbed TLS 3.6.1 through 3.6.3 before 3.6.4, a timing discrepancy in block cipher padding removal allows an attacker to recover the plaintext when PKCS#7 padding mode is used.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Mbed Mbedtls — versions 3.6.1
- Trustedfirmware Mbed TLS
Weakness classification (CWE)
References
- mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/ (Vendor Advisory)
- github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security… (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-49087?
- CVE-2025-49087 is a medium-severity vulnerability in Mbed Mbedtls, classified under CWE-385. CVSS score: 4.0/10. Published 2025-07-20.
- How severe is CVE-2025-49087?
- Medium severity. CVSS v3 base score is 4.0 out of 10.