CVE-2022-40843Public exploitNetwork attack vector

Administrator credential disclosure via empty session cookie

Published Nov 15, 2022 · Updated Aug 3, 2024

Authentication bypass in Tenda AC1200 V-W15Ev2 firmware 15.11.0.10(1576) allows remote attackers to read administrator credentials. The authSecurityHandler accepts an empty W15Ev2_user cookie as a valid session and serves /goform/downloadSyslog/syslog.log, which records the administrator password. The local web interface is exposed by default; internet reachability requires Remote Web Management, and the demonstrated impact is credential disclosure.

CVSS severity4.9
Medium
EPSS probability28.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Tenda AC1200 V-W15Ev2 firmware 15.11.0.10(1576) allows remote attackers to read administrator credentials. The authSecurityHandler accepts an empty W15Ev2_user cookie as a valid session and serves /goform/downloadSyslog/syslog.log, which records the administrator password. The local web interface is exposed by default; internet reachability requires Remote Web Management, and the demonstrated impact is credential disclosure.

The record

CVE
CVE-2022-40843
Published
Nov 15, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1552.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
9.9Olivier LaflammeCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/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 exploitPublished

Weakness, pattern, technique

T1552.001Unsecured Credentials: Credentials In Files

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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