What is the CVSS score of CVE-2021-31538?

CVE-2021-31538 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 1.5%.

Is there a public PoC exploit available for CVE-2021-31538?

Yes, a public proof-of-concept exploit is available for CVE-2021-31538. Prioritise patching immediately. EPSS: 1.5%.

Lcos Fx CVE-2021-31538

HIGH

Path Traversal (CWE-22)

2021-06-10 cve@mitre.org

Path Traversal Lcos Fx

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

CVE Published

Jun 10, 2021 - 15:15 nvd

HIGH 7.5

DescriptionNVD

LANCOM R&S Unified Firewall (UF) devices running LCOS FX 10.5 allow Relative Path Traversal.

AnalysisAI

LANCOM R&S Unified Firewall (UF) devices running LCOS FX 10.5 allow Relative Path Traversal. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Path Traversal (CWE-22), which allows attackers to access files and directories outside the intended path. LANCOM R&S Unified Firewall (UF) devices running LCOS FX 10.5 allow Relative Path Traversal. Affected products include: Lancom-Systems Lcos Fx.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate and canonicalize file paths. Use chroot or sandboxing. Reject input containing path separators or '../' sequences.