HOMEVULNERABILITIESCVE-2021-24356
HIGH

CVE-2021-24356

CWE-862Published: June 14, 2021· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, a lack of capability checks and insufficient nonce check on the AJAX action, simple301redirects/admin/activate_plugin, made it possible for authenticated users to activate arbitrary plugins installed on vulnerable sites.

NVD Source

Technical Analysis

CVE-2021-24356 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

wpdeveloper1 product(s)
simple 301 redirects
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://wpscan.com/vulnerability/be356530-5e00-4f27-8177-b80f3c1ae6e8
ADVISORYhttps://www.wordfence.com/blog/2021/05/severe-vulnerabilities-patched-in-simple-301-redirects-by-betterlinks-plugin/
ADVISORYhttps://wpscan.com/vulnerability/be356530-5e00-4f27-8177-b80f3c1ae6e8
ADVISORYhttps://www.wordfence.com/blog/2021/05/severe-vulnerabilities-patched-in-simple-301-redirects-by-betterlinks-plugin/

All References (4)

→
https://wpscan.com/vulnerability/be356530-5e00-4f27-8177-b80f3c1ae6e8Exploit · Third Party Advisory
→
https://www.wordfence.com/blog/2021/05/severe-vulnerabilities-patched-in-simple-301-redirects-by-betterlinks-plugin/Exploit · Third Party Advisory
→
https://wpscan.com/vulnerability/be356530-5e00-4f27-8177-b80f3c1ae6e8Exploit · Third Party Advisory
→
https://www.wordfence.com/blog/2021/05/severe-vulnerabilities-patched-in-simple-301-redirects-by-betterlinks-plugin/Exploit · Third Party Advisory

Quick Facts

CVE IDCVE-2021-24356
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-862
CISA KEVNo
Affected1 vendor(s)
PublishedJun 14, 2021

Related CVEs (CWE-862)

CVE-2026-34976
10.0
CVE-2026-33712
10.0
CVE-2025-22609
10.0
CVE-2024-52416
10.0
CVE-2025-30416
10.0
CVE-2026-2031
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-24356 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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