CVE-2026-82555Public exploitNetwork attack vector

Session hijacking via timestamp-derived authentication cookies

Published Aug 30, 2026 · Updated Aug 30, 2026

Insufficient randomness in TOTOLINK N600R 4.3.0cu.7866_B20220506 allows remote attackers to hijack an authenticated router session. The loginAuth handler in /web_cste/cgi-bin/cstecgi.cgi derives cookie_key by hashing the current Unix timestamp with MD5, allowing recent values to be enumerated. No credentials or user interaction are required, but success depends on finding a still-valid timestamp-derived cookie and grants only that session's access.

CVSS severityUnavailable
Unscored
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient randomness in TOTOLINK N600R 4.3.0cu.7866_B20220506 allows remote attackers to hijack an authenticated router session. The loginAuth handler in /web_cste/cgi-bin/cstecgi.cgi derives cookie_key by hashing the current Unix timestamp with MD5, allowing recent values to be enumerated. No credentials or user interaction are required, but success depends on finding a still-valid timestamp-derived cookie and grants only that session's access.

The record

CVE
CVE-2026-82555
Published
Aug 30, 2026
Updated
Aug 30, 2026
Vendor
TOTOLINK
Product
N600R
Classifications
CWE-310, CWE-330, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 30, 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=4.3.0cu.7866_B20220506

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · N600Rversion=4.3.0cu.7866_B20220506

Published CVSS scores

6.3VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
2.6VulDBAV:N/AC:H/Au:N/C:P/I:N/A:N/E:POC/RL:ND/RC:UR
3.7VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R
3.7VulDBCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R

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 exploitPublished

Weakness, pattern, technique

CWE-310Cryptographic Issues
CWE-330Insufficiently Random Values
T1550.004Use Alternate Authentication Material: Web Session Cookie

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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