CVE-2021-31923

Name: CVE-2021-31923
Creator: NVD / NIST
Published: 2021-09-24T03:15:06.497+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.69%

Last modified Jun 17, 2026

CVE-2021-31923 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Ping Identity PingAccess before 5.3.3 allows HTTP request smuggling via header manipulation.. EPSS estimates a 0.69% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.69%

47.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-444

Affected Software

Vendor	Product	Versions
Pingidentity	Pingaccess	< 5.3.3

References

Timeline

Published: Sep 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31923?

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

How severe is CVE-2021-31923?

CVE-2021-31923 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.69% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31923?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31923?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST