What is CVE-2009-5140?

CVE-2009-5140 is a high-severity vulnerability in Linksys Spa2102, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 8.8/10. Published 2020-02-12.

How severe is CVE-2009-5140?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Linksys Spa2102

CVE-2009-5140

The SIP implementation on the Linksys SPA2102 phone adapter provides hashed credentials in a response to an invalid authentication challenge, which makes it easier for remote attackers to obtain access via a brute-force attack, related to a "SIP Digest Leak" issue.

Published 2020-02-12 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (70.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

References

resources.enablesecurity.com/resources/sipdigestleak-tut.pdf (Mailing List, Third Party Advisory)
voipsa.org/pipermail/voipsec_voipsa.org/2009-April/002946.html (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2009-5140?: CVE-2009-5140 is a high-severity vulnerability in Linksys Spa2102, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 8.8/10. Published 2020-02-12.
How severe is CVE-2009-5140?: High severity. CVSS v3 base score is 8.8 out of 10.