EUVD-2025-20079Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
4DescriptionCVE.org
In MbedTLS 3.3.0 before 3.6.4, mbedtls_lms_import_public_key does not check that the input buffer is at least 4 bytes before reading a 32-bit field, allowing a possible out-of-bounds read on truncated input. Specifically, an out-of-bounds read in mbedtls_lms_import_public_key allows context-dependent attackers to trigger a crash or limited adjacent-memory disclosure by supplying a truncated LMS (Leighton-Micali Signature) public-key buffer under four bytes. An LMS public key starts with a 4-byte type indicator. The function mbedtls_lms_import_public_key reads this type indicator before validating the size of its input.
Analysis
In MbedTLS 3.3.0 before 3.6.4, mbedtls_lms_import_public_key does not check that the input buffer is at least 4 bytes before reading a 32-bit field, allowing a possible out-of-bounds read on truncated input. Specifically, an out-of-bounds read in mbedtls_lms_import_public_key allows context-dependent attackers to trigger a crash or limited adjacent-memory disclosure by supplying a truncated LMS (Leighton-Micali Signature) public-key buffer under four bytes. An LMS public key starts with a 4-byte type indicator. The function mbedtls_lms_import_public_key reads this type indicator before validating the size of its input.
Technical ContextAI
An out-of-bounds memory access occurs when code reads from or writes to memory locations outside the intended buffer boundaries. This vulnerability is classified as Out-of-bounds Read (CWE-125).
RemediationAI
Implement proper bounds checking on all array and buffer accesses. Use memory-safe languages or static analysis tools to detect OOB issues.
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An issue was discovered in Mbed TLS 3.5.1. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, n
Alpine Linux: mbedtls fixed in 3.6.2-r0
An issue was discovered in Mbed TLS before 2.28.2 and 3.x before 3.3.0. Rated critical severity (CVSS 9.8), this vulnera
Alpine Linux: mbedtls fixed in 3.6.1-r0
Alpine Linux: mbedtls fixed in 3.6.1-r0
Mbed TLS versions 2.19.0 through 3.6.5 and 4.0.0 allow remote code execution through memory corruption when attackers mo
ARM mbed TLS before 1.3.22, before 2.1.10, and before 2.7.0, when the truncated HMAC extension and CBC are used, allows
Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
View allVendor StatusVendor
Ubuntu
Priority: Medium| Release | Status | Version |
|---|---|---|
| oracular | ignored | end of life, was needs-triage |
| bionic | not-affected | code not present |
| focal | not-affected | code not present |
| jammy | not-affected | code not present |
| noble | not-affected | code not present |
| upstream | released | 3.6.4 |
| xenial | not-affected | code not present |
| plucky | ignored | end of life, was needed |
| questing | needed | - |
Debian
Bug #1108788| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | not-affected | - | - |
| bullseye (security) | fixed | 2.16.9-0.1+deb11u3 | - |
| bookworm | not-affected | - | - |
| trixie | fixed | 3.6.5-0.1~deb13u1 | - |
| forky, sid | fixed | 3.6.5-0.1 | - |
| (unstable) | fixed | 3.6.4-1 | - |
SUSE
Severity: MediumShare
External POC / Exploit Code
Leaving vuln.today