What is the CVSS score of CVE-2021-24040?

CVE-2021-24040 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 17.4%.

Is there a public PoC exploit available for CVE-2021-24040?

Yes, a public proof-of-concept exploit is available for CVE-2021-24040. Prioritise patching immediately. EPSS: 17.4%.

Is there a patch available for CVE-2021-24040?

Yes, a patch is available for CVE-2021-24040. Update the affected software to the latest version immediately.

Parlai CVE-2021-24040

CRITICAL

Deserialization of Untrusted Data (CWE-502)

2021-09-10 cve-assign@fb.com

Deserialization RCE Parlai

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Sep 10, 2021 - 22:15 nvd

CRITICAL 9.8

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

1 pypi packages depend on parlai (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 1.1.0.

DescriptionNVD

AnalysisAI

Due to use of unsafe YAML deserialization logic, an attacker with the ability to modify local YAML configuration files could provide malicious input, resulting in remote code execution or similar. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Deserialization of Untrusted Data (CWE-502), which allows attackers to execute arbitrary code through malicious serialized objects. Due to use of unsafe YAML deserialization logic, an attacker with the ability to modify local YAML configuration files could provide malicious input, resulting in remote code execution or similar risks.1.0. Affected products include: Facebook Parlai.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Avoid deserializing untrusted data. Use safe serialization formats (JSON). Implement integrity checks and type allowlists.