What it is
CVE-2021-24217 is an unauthenticated Facebook for WordPress < 3.0.0 - PHP Object Injection with POP Chain. The run_action function of the Facebook for WordPress plugin before 3.0.0 deserializes user supplied data...
Vulnerability report
Exploited in the wild
High confidence
Not in CISA KEV
CVE-2021-24217
Facebook for WordPress < 3.0.0 - PHP Object Injection with POP Chain
Unknown / Facebook for WordPress · affected before 3.0.0
- Severity
- CVSS 8.1 · High
- Confidence
- High
- Exploit status
- Exploited in the wild
- EPSS
- 3.5%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is high.
Who is affected?
Unknown / Facebook for WordPress affected before 3.0.0.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Facebook for WordPress < 3.0.0 - PHP Object Injection with POP Chain
The run_action function of the Facebook for WordPress plugin before 3.0.0 deserializes user supplied data making it possible for PHP objects to be supplied creating an Object Injection vulnerability.
There was also a useable magic method in the plugin that could be used to achieve remote code execution.
Vendor
Product
Affected
Status
Unknown
Facebook for WordPress
Before 3.0.0
Affected
- Published
- 12 Apr 2021
- Exploitation Reported
- 25 Mar 2021
- Attack vector
- Remote
- Complexity
- High
- Privileges
- None
- User interaction
- None
Tags
wordpress
php
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2021-24217
- wpscan.com/vulnerability/509f2754-a1a1-4142-9126-ae023a... wpscan.com · CVE Record https://wpscan.com/vulnerability/509f2754-a1a1-4142-9126-ae023a88533a
- wordfence.com/blog/2021/03/two-vulnerabilities-patched-in-... wordfence.com · CVE Record https://www.wordfence.com/blog/2021/03/two-vulnerabilities-patched-in...
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
Wordfence
Independent exploitation attestation added to the KEV Intelligence record.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| Wordfence First | 2021-03-25 07:17 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
8.1
High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
3.5%
Weaknesses
All CVSS Scores
CVSS v3.1
8.1
High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0
6.8
Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P
Timeline
From disclosure to observed exploitation
-
CVE published
Vulnerability disclosed publicly
-
Added to KEV Intelligence KEV Feed
High-confidence, third-party attested exploitation
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2021-24217
Free JSON includes basic KEV fields{
"cve_id": "CVE-2021-24217",
"confidence": "High",
"cvss_score": 8.1,
"cvss_estimated": false,
"epss_score": 0.0352,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.