EUVD-2025-20080Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A04:2025 - Cryptographic Failures
ASVS 5.0
V11 - Cryptography Cryptographic step completeness
|
| Impact | CVSS 4.9. EPSS 0.0%. No patch confirmed. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability in MbedTLS 3.3.0 to compromise the security of affected deployments, potentially impacting confidentiality, integrity, or availability. |
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Alert meAnalysisAIv1 – Mar 16, 2026
A security vulnerability in MbedTLS 3.3.0 (CVSS 4.9). Remediation should follow standard vulnerability management procedures.
Earlier versions of this analysis (1)
In MbedTLS 3.3.0 before 3.6.4, mbedtls_lms_verify may accept invalid signatures if hash computation fails and internal errors go unchecked, enabling LMS (Leighton-Micali Signature) forgery in a fault
RemediationAI
Monitor vendor channels for patch availability.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Vulnerability type not specified by vendor. Affects MbedTLS 3.3.0.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:P/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
In MbedTLS 3.3.0 before 3.6.4, mbedtls_lms_verify may accept invalid signatures if hash computation fails and internal errors go unchecked, enabling LMS (Leighton-Micali Signature) forgery in a fault scenario. Specifically, unchecked return values in mbedtls_lms_verify allow an attacker (who can induce a hardware hash accelerator fault) to bypass LMS signature verification by reusing stale stack data, resulting in acceptance of an invalid signature. In mbedtls_lms_verify, the return values of the internal Merkle tree functions create_merkle_leaf_value and create_merkle_internal_value are not checked. These functions return an integer that indicates whether the call succeeded or not. If a failure occurs, the output buffer (Tc_candidate_root_node) may remain uninitialized, and the result of the signature verification is unpredictable. When the software implementation of SHA-256 is used, these functions will not fail. However, with hardware-accelerated hashing, an attacker could use fault injection against the accelerator to bypass verification.
Executive ViewAI
Organizations using MbedTLS 3.3.0 should be aware of moderate risk from CVE-2025-49600 rated CVSS 4.9. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and monitor for exploitation.
Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
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Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler optimizations occur. An attacker may b
Mbed TLS 3.2.x through 3.4.x before 3.5 has a Buffer Overflow that can lead to remote Code execution. Rated critical sev
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-325 – Missing Cryptographic Step
View allSame technique Authentication Bypass
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 #1108787| 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 | - |
Exploit-DB