What is the CVSS score of CVE-2021-31923?

CVE-2021-31923 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.7%.

Pingaccess CVE-2021-31923

MEDIUM

HTTP Request/Response Smuggling (CWE-444)

2021-09-24 responsible-disclosure@pingidentity.com

Request Smuggling Information Disclosure Pingaccess

5.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

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

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:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

CVE Published

Sep 24, 2021 - 03:15 nvd

MEDIUM 5.3

DescriptionNVD

Ping Identity PingAccess before 5.3.3 allows HTTP request smuggling via header manipulation.

AnalysisAI

Ping Identity PingAccess before 5.3.3 allows HTTP request smuggling via header manipulation. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as HTTP Request/Response Smuggling (CWE-444), which allows attackers to manipulate HTTP request interpretation between frontend and backend servers. Ping Identity PingAccess before 5.3.3 allows HTTP request smuggling via header manipulation. Affected products include: Pingidentity Pingaccess. Version information: before 5.3.3.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Enforce strict HTTP parsing, normalize requests at proxy layer, use HTTP/2 end-to-end, reject ambiguous headers.