CVE-2024-21894Network attack vector

Service crash via IPSec heap overflow

Published Apr 4, 2024 · Updated Oct 3, 2024

Heap overflow in the IPSec component of Ivanti Connect Secure and Policy Secure 9.x and 22.x allows remote attackers to crash the service. Ivanti states that crafted requests overflow heap memory, but has not disclosed the affected parser, function, or missing bounds operation. No authentication or user interaction is required; the established consequence is a service crash, with arbitrary code execution limited to certain undisclosed conditions.

CVSS severity9.8
Critical
EPSS probability18.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in the IPSec component of Ivanti Connect Secure and Policy Secure 9.x and 22.x allows remote attackers to crash the service. Ivanti states that crafted requests overflow heap memory, but has not disclosed the affected parser, function, or missing bounds operation. No authentication or user interaction is required; the established consequence is a service crash, with arbitrary code execution limited to certain undisclosed conditions.

The record

CVE
CVE-2024-21894
Published
Apr 4, 2024
Updated
Oct 3, 2024
Vendor
Ivanti
Product
Connect Secure
Classifications
CWE-703, CWE-787, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=22.1R6.2
  2. Affected versionversion=22.1R6.2 <22.1R6.2
  3. Affected versionversion=22.2R4.2
  4. Affected versionversion=22.2R4.2 <22.2R4.2
  5. Affected versionversion=22.3R1.2
  6. Affected versionversion=22.3R1.2 <22.3R1.2
  7. Affected versionversion=22.4R1.2
  8. Affected versionversion=22.4R1.2 <22.4R1.2
  9. Affected versionversion=22.4R2.4
  10. Affected versionversion=22.4R2.4 <22.4R2.4
  11. Affected versionversion=22.5R1.3
  12. Affected versionversion=22.5R1.3 <22.5R1.3
  13. Affected versionversion=22.5R2.4
  14. Affected versionversion=22.5R2.4 <22.5R2.4
  15. Affected versionversion=22.6R2.3
  16. Affected versionversion=22.6R2.3 <22.6R2.3
  17. Affected versionversion=9.1R14.6
  18. Affected versionversion=9.1R14.6 <9.1R14.6
  19. Affected versionversion=9.1R15.4
  20. Affected versionversion=9.1R15.4 <9.1R15.4
  21. Affected versionversion=9.1R16.4
  22. Affected versionversion=9.1R16.4 <9.1R16.4
  23. Affected versionversion=9.1R17.4
  24. Affected versionversion=9.1R17.4 <9.1R17.4
  25. Affected versionversion=9.1R18.5
  26. Affected versionversion=9.1R18.5 <9.1R18.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ivanti · Connect Secureversion=22.1R6.2; version=22.1R6.2 <22.1R6.2; version=22.2R4.2; version=22.2R4.2 <22.2R4.2; version=22.3R1.2; version=22.3R1.2 <22.3R1.2; version=22.4R1.2; version=22.4R1.2 <22.4R1.2; version=22.4R2.4; version=22.4R2.4 <22.4R2.4; version=22.5R1.3; version=22.5R1.3 <22.5R1.3; version=22.5R2.4; version=22.5R2.4 <22.5R2.4; version=22.6R2.3; version=22.6R2.3 <22.6R2.3; version=9.1R14.6; version=9.1R14.6 <9.1R14.6; version=9.1R15.4; version=9.1R15.4 <9.1R15.4; version=9.1R16.4; version=9.1R16.4 <9.1R16.4; version=9.1R17.4; version=9.1R17.4 <9.1R17.4; version=9.1R18.5; version=9.1R18.5 <9.1R18.5
Ivanti · Policy Secureversion=22.4R1.2; version=22.4R1.2 <22.4R1.2; version=22.6R1.2; version=22.6R1.2 <22.6R1.2; version=9.1R16.4; version=9.1R16.4 <9.1R16.4; version=9.1R17.4; version=9.1R17.4 <9.1R17.4; version=9.1R18.5; version=9.1R18.5 <9.1R18.5

Published CVSS scores

8.2HackerOne CNACVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-703Improper Check or Handling of Exceptional Conditions
CWE-787Out-of-bounds Write
T1498Network Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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