CVE-2021-24966Public exploitNetwork attack vector

Arbitrary file clearing via unchecked log path

Published Mar 14, 2022 · Updated Aug 3, 2024

External path control in BestWebSoft Error Log Viewer 1.1.1 and earlier allows remote authenticated users to erase arbitrary file contents. The Log Monitor handler accepts the rrrlgvwr_clear_file_name POST value as a filesystem path and empties the referenced file without constraining it to configured logs. Administrator-level WordPress access and a valid nonce are required; writable files outside the site directory can be reduced to zero bytes.

CVSS severity4.9
Medium
EPSS probability5.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

External path control in BestWebSoft Error Log Viewer 1.1.1 and earlier allows remote authenticated users to erase arbitrary file contents. The Log Monitor handler accepts the rrrlgvwr_clear_file_name POST value as a filesystem path and empties the referenced file without constraining it to configured logs. Administrator-level WordPress access and a valid nonce are required; writable files outside the site directory can be reduced to zero bytes.

The record

CVE
CVE-2021-24966
Published
Mar 14, 2022
Updated
Aug 3, 2024
Vendor
BestWebSoft
Product
Error Log Viewer
Classifications
CWE-73, T1485
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 14, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.1.1 <=1.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

BestWebSoft · Error Log Viewerversion=1.1.1 <=1.1.1

Published CVSS scores

4.9NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
4.0NVDAV:N/AC:L/Au:S/C:N/I:P/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-73External Control of File Name or Path
T1485Data Destruction

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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