CVE-2021-34543Public exploitNetwork attack vector

Unauthenticated administrative access via exposed configuration page

Published Dec 7, 2021 · Updated Nov 11, 2024

Authentication bypass in Solar-Log 500 before 2.8.2 Build 52 allows remote attackers to gain administrative access over HTTP. The web administration server exposes /lan.html without checking authentication, so the configuration interface grants administrative functions to any requester. Network reachability alone is sufficient; an unauthenticated requester can modify configuration files and change system status.

CVSS severity7.5
High
EPSS probability2.93%
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 Solar-Log 500 before 2.8.2 Build 52 allows remote attackers to gain administrative access over HTTP. The web administration server exposes /lan.html without checking authentication, so the configuration interface grants administrative functions to any requester. Network reachability alone is sufficient; an unauthenticated requester can modify configuration files and change system status.

The record

CVE
CVE-2021-34543
Published
Dec 7, 2021
Updated
Nov 11, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 11, 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

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A: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 exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

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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