Security readout for executives and security teams
Plain-English summary
This flaw can let an unauthenticated remote attacker knock affected Ivanti remote access and zero-trust gateways offline. It is not described as data theft or takeover in the provided sources, but outages in these systems can disrupt VPN, policy enforcement, and remote access operations.
Executive priority
Treat as high priority for any organization relying on affected Ivanti gateways for remote access or policy enforcement. The main business risk is service disruption, not confirmed compromise, but unauthenticated network reachability raises urgency for exposed systems.
Technical view
CVE-2022-35254 is a CWE-416 use-after-free denial-of-service issue affecting Ivanti Connect Secure, Ivanti Policy Secure, and Ivanti Neurons for Zero Trust Access Gateway before listed fixed releases. CVSS 3.1 is 7.5: network attack vector, low complexity, no privileges, no user interaction, high availability impact.
Likely exposure
Exposure is most likely where affected Ivanti VPN, policy, or ZTA gateway appliances are reachable from untrusted networks and have not been upgraded to the branch-specific fixed versions listed by Ivanti/CVE.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. It does support unauthenticated network denial-of-service potential. No exploit details, proof-of-concept status, or weaponization evidence is provided.
Researcher notes
Key details are limited to product/version ranges, CVSS, CWE-416, and denial-of-service impact. The provided sources do not describe root cause mechanics, crash indicators, exploit reliability, or compensating controls beyond upgrading to fixed releases.
Mitigation direction
- Upgrade ICS to 9.1R14.3, 9.1R15.2, 9.1R16.2, 22.2R4, or later as applicable.
- Upgrade IPS to 9.1R17 or 22.3R1, or later as applicable.
- Upgrade Neurons for ZTA Gateway to 22.3R1 or later.
- Review Ivanti advisory SA45520 for branch-specific remediation guidance.
- Prioritize internet-facing remote access gateways because availability impact is the core risk.
Validation and detection
- Inventory Ivanti Connect Secure, Policy Secure, and Neurons ZTA Gateway deployments.
- Compare installed versions against the affected-version ranges in CVE-2022-35254.
- Confirm externally reachable systems are upgraded first.
- Review operational telemetry for unexplained service crashes, restarts, or access outages.
- Document remediation evidence and remaining exceptions by product and version.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2022-35254 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.