What is CVE-2025-15542?

CVE-2025-15542 is a medium-severity vulnerability in TP-Link Vx800v, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.3/10. Published 2026-01-29.

How severe is CVE-2025-15542?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in TP-Link Vx800v

CVE-2025-15542

Improper handling of exceptional conditions in VX800v v1.0 in SIP processing allows an attacker to flood the device with crafted INVITE messages, blocking all voice lines and causing a denial of service on incoming calls.

Published 2026-01-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.003 (19.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

TP-Link Vx800v — versions 1.0
TP-Link Vx800v Firmware
TP-Link Systems Inc. Vx800v V1.0 — versions 0

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

f23511db-6c3e-4e32-a477-6aa17d310630 (Product, patch)
f23511db-6c3e-4e32-a477-6aa17d310630 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-15542?: CVE-2025-15542 is a medium-severity vulnerability in TP-Link Vx800v, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.3/10. Published 2026-01-29.
How severe is CVE-2025-15542?: Medium severity. CVSS v3 base score is 5.3 out of 10.