CVE-2021-22894
HighExploitedPublic exploitA buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously crafted meeting room.
Published May 27, 2021 · Updated Dec 17, 2025
Key Facts
Patch immediately- CVE-2021-22894 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Connect Secure (Ivanti), Pulse Connect Secure.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 20, 2021. Public exploit code is available.
- EPSS estimates a 41% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
41%
Higher than 98.6% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-22894 brief as a PDF
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Description
A buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously crafted meeting room.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | May 3, 2022 | Not reported |
| Industry KEV feed | Aug 20, 2021 | May 3, 2022 | Not reported |
| CIRCL KEV | Nov 3, 2021 | May 3, 2022 | Not reported |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
41 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Connect SecureIvanti | 9.0, 9.0-r1, 9.0-r1.0, 9.0-r2, 9.0-r2.0, 9.0-r2.1, 9.0-r3, 9.0-r3.0 | n/a |
| Pulse Connect Secure | >= Fixed version 9.1R11.4 | n/a |
Timeline
Publicly disclosed
May 27, 2021
Added to Industry KEV feed
Aug 20, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Dec 17, 2025
Weakness Type
- CWE-94 Improper Control of Generation of Code ('Code Injection')
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
FAQ
Common Questions.
A buffer overflow vulnerability exists in Pulse Connect Secure before 9.1R11.4 allows a remote authenticated attacker to execute arbitrary code as the root user via maliciously crafted meeting room.
Affected: Connect Secure (Ivanti) versions 9.0, 9.0-r1, 9.0-r1.0, 9.0-r2, 9.0-r2.0, 9.0-r2.1, 9.0-r3, 9.0-r3.0; Pulse Connect Secure versions >= Fixed version 9.1R11.4. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 20, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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