Connect Secure: Out-of-bounds Read
CVE-2025-5456 is a high-severity out-of-bounds read vulnerability in Connect Secure from Ivanti, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 1.18% chance of exploitation within 30 days, higher than 68% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Neurons For Secure Access to 22.8 or a later version.
- Read the advisory on forums.ivanti.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Ivanti | Connect Secure | Not specified in the record | Not stated |
| Ivanti | Policy Secure | Not specified in the record | Not stated |
| Ivanti | ZTA Gateway | Not specified in the record | Not stated |
| Ivanti | Neurons for Secure | Not specified in the record | Not stated |
| Ivanti | Zero Trust Access Gateway | 22.8 | Not stated |
| Ivanti | Neurons For Secure Access | before 22.8; 22.8 | 22.8 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA.
Official description
A buffer over-read vulnerability in Ivanti Connect Secure before 22.7R2.8 or 22.8R2, Ivanti Policy Secure before 22.7R1.5, Ivanti ZTA Gateway before 2.8R2.3-723 and Ivanti Neurons for Secure Access before 22.8R1.4 (Fix deployed on 02-Aug-2025) allows a remote unauthenticated attacker to trigger a denial of service. CWE-125
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in Connect Secure
- 4.3 Medium severity
- 7.0 High severity
- 8.6 High severity
- 7.6 High severity
- 8.8 High severity
- 8.9 High severity
Recent Out-of-bounds Read vulnerabilities
- 7.8 High severity
- 8.1 High severity
- 9.8 Critical severity
- 8.1 High severity
- 7.8 High severity
- 7.5 High severity
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