CVE-2025-15542Network attack vector

Incoming-call interruption via crafted SIP INVITE floods

Published Jan 29, 2026 · Updated Jan 29, 2026

Improper SIP exception handling in TP-Link VX800v v1.0 allows remote attackers to interrupt incoming calls with crafted INVITE floods. The SIP message-processing path fails to handle exceptional conditions raised by repeated crafted INVITE messages, allowing the flood to block every voice line. No authentication or user interaction is required, but disruption depends on sustaining the message flood; the reported effect is blocked incoming calls rather than data loss or modification.

CVSS severity6.3
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper SIP exception handling in TP-Link VX800v v1.0 allows remote attackers to interrupt incoming calls with crafted INVITE floods. The SIP message-processing path fails to handle exceptional conditions raised by repeated crafted INVITE messages, allowing the flood to block every voice line. No authentication or user interaction is required, but disruption depends on sustaining the message flood; the reported effect is blocked incoming calls rather than data loss or modification.

The record

CVE
CVE-2025-15542
Published
Jan 29, 2026
Updated
Jan 29, 2026
Vendor
TP-Link Systems Inc.
Product
VX800v
Classifications
CWE-754, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <800.0.12 (0.12.0 3.0.0 v603c.0 Build 250912)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TP-Link Systems Inc. · VX800vversion=0 <800.0.12 (0.12.0 3.0.0 v603c.0 Build 250912)

Published CVSS scores

6.3TP-Link Systems Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T1499.002Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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