CVE-2026-19845Public exploitNetwork attack vector

Authenticated memory corruption via unchecked Comment copy

Published Aug 14, 2026 · Updated Aug 14, 2026

Stack-based buffer overflow in TOTOLINK A800R 4.1.2cu.5137_B20200730 allows remote authenticated users to corrupt process memory. The lan.so setStaticDhcpConfig function passes the request-controlled Comment value to strcpy without validating its length against the destination stack buffer. A valid management session is required; an oversized Comment can crash the management process, while reliable code execution has not been demonstrated publicly.

CVSS severity8.8
High
EPSS probability0.47%
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 TOTOLINK A800R 4.1.2cu.5137_B20200730 allows remote authenticated users to corrupt process memory. The lan.so setStaticDhcpConfig function passes the request-controlled Comment value to strcpy without validating its length against the destination stack buffer. A valid management session is required; an oversized Comment can crash the management process, while reliable code execution has not been demonstrated publicly.

The record

CVE
CVE-2026-19845
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
TOTOLINK
Product
A800R
Classifications
CWE-121, CWE-119, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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=4.1.2cu.5137_B20200730

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · A800Rversion=4.1.2cu.5137_B20200730

Published CVSS scores

8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

Public exploit references

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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