What is CVE-2021-22900?
A vulnerability allowed multiple unrestricted uploads in Pulse Connect Secure before 9.1R11.4 that could lead to an authenticated administrator to perform a file write via a maliciously crafted archive upload in the administrator web interface.
The record classifies CVE-2021-22900 under weakness class CWE-94. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 1957 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 7.2 — HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 14.1% probability of exploitation in the next 30 days, higher than 96.2% of all scored CVEs
- CISA KEV
- Listed since 2021-11-03, federal remediation deadline 2022-05-03
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2021-05-27, last modified 2025-10-21
Is CVE-2021-22900 being exploited?
CISA added CVE-2021-22900 to the Known Exploited Vulnerabilities catalog on 2021-11-03, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2022-05-03 under BOD 22-01. Weaponised exploit code for CVE-2021-22900 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 42 in the Threadlinqs vulnerability feed.
- trickest/cve (trickest)
Affected products and versions
- (vendor unspecified): Pulse Secure Secure
How to fix CVE-2021-22900
Vendor advisory: https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/?kA23Z000000boUWSAY. Because CVE-2021-22900 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2022-05-03. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2021-22900
1 tracked threat in the Threadlinqs corpus references CVE-2021-22900, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.