How severe is CVE-2024-21894?

CVE-2024-21894 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-21894 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-21894?

CVE-2024-21894 primarily affects Ivanti Connect Secure. In total, 60 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-21894?

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

Does CVE-2024-21894 have an EU (EUVD) identifier?

Yes. CVE-2024-21894 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19505.

When was CVE-2024-21894 published?

CVE-2024-21894 was published on 2024-04-04 and last updated on 2026-06-17.

CVE-2024-21894

CVE-2024-21894 is a critical-severity vulnerability in Ivanti Connect Secure with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 19% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 19% (97th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-19505
Weakness: CWE-787
Affected product: Ivanti Connect Secure
Published: 2024-04-04
Last modified: 2026-06-17

Description

A heap overflow vulnerability in IPSec component of Ivanti Connect Secure (9.x, 22.x) and Ivanti Policy Secure allows an unauthenticated malicious user to send specially crafted requests in-order-to crash the service thereby causing a DoS attack. In certain conditions this may lead to execution of arbitrary code

Frequently asked questions

What is CVE-2024-21894?: A heap overflow vulnerability in IPSec component of Ivanti Connect Secure (9.x, 22.x) and Ivanti Policy Secure allows an unauthenticated malicious user to send specially crafted requests in-order-to crash the service thereby causing a DoS attack. In certain conditions this may lead to execution of arbitrary code
How severe is CVE-2024-21894?: CVE-2024-21894 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-21894 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-21894?: CVE-2024-21894 primarily affects Ivanti Connect Secure. In total, 60 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-21894?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2024-21894 have an EU (EUVD) identifier?: Yes. CVE-2024-21894 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19505.
When was CVE-2024-21894 published?: CVE-2024-21894 was published on 2024-04-04 and last updated on 2026-06-17.

References

https://forums.ivanti.com/s/article/SA-CVE-2024-21894-Heap-Overflow-CVE-2024-22052-Null-Pointer-Dereference-CVE-2024-22053-Heap-Overflow-and-CVE-2024-22023-XML-entity-expansion-or-XXE-for-Ivanti-Connect-Secure-and-Ivanti-Policy-Secure-Gateways?language=en_US

Affected products (60)

cpe:2.3:a:ivanti:connect_secure:9.1:r1:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:9.1:r10:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:9.1:r11:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:9.1:r11.5:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:9.1:r12:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:9.1:r13:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:9.1:r14:*:*:lts:*:*:*
cpe:2.3:a:ivanti:connect_secure:9.1:r15:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:9.1:r16:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:9.1:r17:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:9.1:r18:*:*:*:*:*:*
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:r9:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:22.1:*:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:22.2:*:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:22.3:*:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:22.4:*:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:22.5:*:*:*:*:*:*:*
cpe:2.3:a:ivanti:connect_secure:22.6:*:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.0:-:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.0:r1:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.0:r2:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.0:r2.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.0:r3:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.0:r3.1:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.0:r4:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.1:-:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.1:r1:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.1:r10:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.1:r11:*:*:*:*:*:*
cpe:2.3:a:ivanti:policy_secure:9.1:r12:*:*:*:*:*:*

More vulnerabilities in Ivanti Connect Secure

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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…
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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.
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