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CVE-2021-24040

52
FAUCET Score

CVE-2021-24040 is a critical deserialization vulnerability affecting Facebook ParlAI versions prior to 1.1.0. An attacker with local file modification capabilities can inject malicious YAML configuration, leading to remote code execution. With a CVSS score of 9.8 (CRITICAL), this vulnerability is easily exploitable over the network with no user interaction required, posing a significant risk of complete compromise. While not listed in CISA KEV, an ExploitDB entry exists, and community discussion is notably high, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.1.0CPE match
cpe:2.3:a:facebook:parlai:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
17.35%
Probability of exploitation in next 30 days
EPSS Percentile
96.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-50289 · Sep 13, 2021
This CVE's current EPSS score of 0.1735 is in the 93rd percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: parlaiFixed in: 1.1.0

Vendor Advisories (1)

pipGHSA-mwgj-7x7j-6966medium

Deserialization of Untrusted Data in ParlAI

Sep 13, 2021

References

packetstormsecurity.com / files/164136/Facebook-ParlAI-1.0.0-Code-Execution-Deserialization.html
ExploitThird Party AdvisoryVDB Entry
github.com / facebookresearch/ParlAI/releases/tag/v1.1.0
Release NotesThird Party Advisory
github.com / facebookresearch/ParlAI/security/advisories/GHSA-m87f-9fvv-2mgg
PatchThird Party Advisory