How severe is CVE-2021-31922?

CVE-2021-31922 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-31922 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31922?

CVE-2021-31922 primarily affects Pulsesecure Virtual Traffic Manager. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-31922?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-31922 published?

CVE-2021-31922 was published on 2021-05-14 and last updated on 2026-06-17.

CVE-2021-31922

CVE-2021-31922 is a high-severity vulnerability in Pulsesecure Virtual Traffic Manager with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-444.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-444
Affected product: Pulsesecure Virtual Traffic Manager
Published: 2021-05-14
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-31922?: 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.
How severe is CVE-2021-31922?: CVE-2021-31922 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-31922 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31922?: CVE-2021-31922 primarily affects Pulsesecure Virtual Traffic Manager. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-31922?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-31922 published?: CVE-2021-31922 was published on 2021-05-14 and last updated on 2026-06-17.

References

https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44790

Affected products (10)

cpe:2.3:a:pulsesecure:virtual_traffic_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:pulsesecure:virtual_traffic_manager:18.2:-:*:*:*:*:*:*
cpe:2.3:a:pulsesecure:virtual_traffic_manager:18.2:r1:*:*:*:*:*:*
cpe:2.3:a:pulsesecure:virtual_traffic_manager:19.2:-:*:*:*:*:*:*
cpe:2.3:a:pulsesecure:virtual_traffic_manager:19.2:r1:*:*:*:*:*:*
cpe:2.3:a:pulsesecure:virtual_traffic_manager:19.2:r2:*:*:*:*:*:*
cpe:2.3:a:pulsesecure:virtual_traffic_manager:19.3:*:*:*:*:*:*:*
cpe:2.3:a:pulsesecure:virtual_traffic_manager:20.1:-:*:*:*:*:*:*
cpe:2.3:a:pulsesecure:virtual_traffic_manager:20.2:-:*:*:*:*:*:*
cpe:2.3:a:pulsesecure:virtual_traffic_manager:20.3:-:*:*:*:*:*:*

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