CVE-2021-31922

Name: CVE-2021-31922
Creator: NVD / NIST
Published: 2021-05-14T01:15:06.937+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.97%

Last modified Jun 17, 2026

CVE-2021-31922 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An HTTP Request Smuggling vulnerability in Pulse Secure Virtual Traffic Manager before 21.1 could allow an attacker to smuggle an HTTP request through an HTTP/2 Header. This vulnerability is resolved in 21.1, 20.3R1, 20.2R1, 20.1R2, 19.2R4, and 18.2R3.. EPSS estimates a 0.97% chance of exploitation in the next 30 days.

Description

An HTTP Request Smuggling vulnerability in Pulse Secure Virtual Traffic Manager before 21.1 could allow an attacker to smuggle an HTTP request through an HTTP/2 Header. This vulnerability is resolved in 21.1, 20.3R1, 20.2R1, 20.1R2, 19.2R4, and 18.2R3.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.97%

57.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-444

Affected Software

Vendor	Product	Versions
Pulsesecure	Virtual Traffic Manager	<= 18.1
Pulsesecure	Virtual Traffic Manager	>= 18.3, <= 19.1
Pulsesecure	Virtual Traffic Manager	18.2
Pulsesecure	Virtual Traffic Manager	19.2
Pulsesecure	Virtual Traffic Manager	19.3
Pulsesecure	Virtual Traffic Manager	20.1
Pulsesecure	Virtual Traffic Manager	20.2
Pulsesecure	Virtual Traffic Manager	20.3

References

https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44790Exploit, Patch, Vendor Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44790Exploit, Patch, Vendor Advisory

Timeline

Published: May 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31922?

How severe is CVE-2021-31922?

CVE-2021-31922 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.97% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31922?

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-2021-31922?

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

Scan your code now

Source: NVD / NIST