CVE-2021-22894

CVE-2021-22894 is a high-severity vulnerability in Ivanti Connect Secure with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03). The underlying weakness is classified as CWE-119.

Key facts

• Severity: High (CVSS 3.x base score 8.8)
• CVSS v2: 9.0
• EPSS exploit prediction: 41% (98th percentile)
• Actively exploited: Yes — listed in CISA KEV (added 2021-11-03)
• EU (EUVD) id: EUVD-2021-10026
• EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2021-11-03)
• Weakness: CWE-119
• Affected product: Ivanti Connect Secure
• Published: 2021-05-27
• Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-22894?

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.

How severe is CVE-2021-22894?

CVE-2021-22894 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-22894 being actively exploited?

Yes. CVE-2021-22894 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2021-22894?

CVE-2021-22894 primarily affects Ivanti Connect Secure. In total, 40 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-22894?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2021-22894 have an EU (EUVD) identifier?

Yes. CVE-2021-22894 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-10026. It is also flagged as exploited in the EUVD (since 2021-11-03).

When was CVE-2021-22894 published?

CVE-2021-22894 was published on 2021-05-27 and last updated on 2026-06-17.

References

• https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/?kA23Z000000boUWSAY
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22894

Affected products (40)

• cpe:2.3:a:ivanti:connect_secure:9.0:-:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r1:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r1.0:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r2:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r2.0:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r2.1:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r3:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r3.0:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r3.1:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r3.2:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r3.3:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r3.5:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r4:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r4.0:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r4.1:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r5.0:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.0:r6.0:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:-:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r1:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r10.0:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r10.2:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r11.0:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r11.1:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r11.3:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r2:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r3:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r4:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r4.1:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r4.2:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r4.3:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r5:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r6:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r7:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r8:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r8.1:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r8.2:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r8.4:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r9:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r9.1:*:*:*:*:*:*
• cpe:2.3:a:ivanti:connect_secure:9.1:r9.2:*:*:*:*:*:*

More vulnerabilities in Ivanti Connect Secure

• CVE-2021-22893 — Critical (CVSS 10.0): Pulse Connect Secure 9.0R3/9.1R1 and higher is vulnerable to an authentication bypass vulnerability exposed by the…
• CVE-2019-11510 — Critical (CVSS 10.0): In Pulse Secure Pulse Connect Secure (PCS) 8.2 before 8.2R12.1, 8.3 before 8.3R7.1, and 9.0 before 9.0R3.4, an…
• CVE-2016-4787 — Critical (CVSS 10.0): Pulse Connect Secure (PCS) 8.2 before 8.2r1, 8.1 before 8.1r2, 8.0 before 8.0r10, and 7.4 before 7.4r13.4 allow remote…
• CVE-2025-22467 — Critical (CVSS 9.9): A stack-based buffer overflow in Ivanti Connect Secure before version 22.7R2.6 allows a remote authenticated attacker…
• CVE-2024-21894 — Critical (CVSS 9.8): A heap overflow vulnerability in IPSec component of Ivanti Connect Secure (9.x, 22.x) and Ivanti Policy Secure allows…
• CVE-2018-20813 — Critical (CVSS 9.8): An input validation issue has been found with login_meeting.cgi in Pulse Secure Pulse Connect Secure 8.3RX before 8.3R2.

All CVEs affecting Ivanti Connect Secure →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

• CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
• CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
• CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
• CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
• CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
• CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →