CVE-2026-12935Network attack vector

Remote code execution via RTSP conntrack stack overflow

Published Jul 29, 2026 · Updated Jul 29, 2026

Stack-based buffer overflow in TP-Link TL-WR940N v6 firmware allows remote attackers to execute code via a crafted RTSP message. The RTSP connection tracking kernel module mishandles the message and overwrites a stack buffer while inspecting the connection. Exploitation requires a LAN client behind the router to contact an attacker-controlled RTSP server; the result can be a router crash or device compromise.

CVSS severity8.7
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in TP-Link TL-WR940N v6 firmware allows remote attackers to execute code via a crafted RTSP message. The RTSP connection tracking kernel module mishandles the message and overwrites a stack buffer while inspecting the connection. Exploitation requires a LAN client behind the router to contact an attacker-controlled RTSP server; the result can be a router crash or device compromise.

The record

CVE
CVE-2026-12935
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
TP-Link Systems Inc.
Product
TL-WR940N
Classifications
CWE-121, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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 <(EU)_V6_260528
  2. Affected versionversion=0 <(JP)_V6_260527
  3. Affected versionversion=0 <(US)_V6_260528

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TP-Link Systems Inc. · TL-WR940Nversion=0 <(EU)_V6_260528; version=0 <(JP)_V6_260527; version=0 <(US)_V6_260528

Published CVSS scores

8.7TP-Link Systems Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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-121Stack-based Buffer Overflow
T1203Exploitation for Client Execution

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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