CVE-2021-24325Network attack vector

Reflected XSS via unescaped settings tab parameter

Published May 17, 2021 · Updated Aug 3, 2024

Reflected XSS in Clogica 404 SEO Redirection 1.3 and earlier allows remote attackers to execute script via a crafted tab parameter. The settings page writes the unsanitized, unescaped tab value into an HTML attribute, allowing attacker-controlled markup to break into script execution. Exploitation requires a victim to open the crafted settings-page request; the resulting script runs in that victim's browser context and can read or modify data available to that session.

CVSS severity6.1
Medium
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Clogica 404 SEO Redirection 1.3 and earlier allows remote attackers to execute script via a crafted tab parameter. The settings page writes the unsanitized, unescaped tab value into an HTML attribute, allowing attacker-controlled markup to break into script execution. Exploitation requires a victim to open the crafted settings-page request; the resulting script runs in that victim's browser context and can read or modify data available to that session.

The record

CVE
CVE-2021-24325
Published
May 17, 2021
Updated
Aug 3, 2024
Vendor
Clogica
Product
404 SEO Redirection
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2021CVE 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=1.3 <=1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Clogica · 404 SEO Redirectionversion=1.3 <=1.3

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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