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Vulnerability record · CVE-2021-42130 · published 7 December 2021

CVE-2021-42130: Ivanti Avalanche Inforail Service deserialization allows code execution

Ivanti · Avalanche

Ivanti Avalanche before 6.3.3 deserializes untrusted data in the Inforail Service, allowing an attacker with access to that service to execute arbitrary code. The flaw is a CWE-502 deserialization issue rated CVSS 3.1 8.8 (HIGH). Because it yields full code execution on a management component, it is a serious risk for exposed deployments.

8.8 CVSS 3.1 High EPSS 62% · top 0.8% CWE-502 · Deserialization of untrusted data
8.8CVSS 3.1 base score, v2 6.5
62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A deserialization of untrusted data vulnerability exists in Ivanti Avalanche before 6.3.3 allows an attacker with access to the Inforail Service to perform arbitrary code execution.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 19 September 2026. Confidence: medium.

high priorityNetwork-reachable deserialization leading to code execution with high EPSS, though it requires low privileges and no KEV listing.

What it is

Ivanti Avalanche before 6.3.3 deserializes untrusted data in the Inforail Service, allowing an attacker with access to that service to execute arbitrary code. The flaw is a CWE-502 deserialization issue rated CVSS 3.1 8.8 (HIGH). Because it yields full code execution on a management component, it is a serious risk for exposed deployments.

Impact

An attacker who can reach the Inforail Service gains arbitrary code execution on the Avalanche server, with high impact to confidentiality, integrity and availability. This can lead to full compromise of the host and any managed mobile devices.

Attack surface

The vector is network-reachable (AV:N) with low attack complexity and no user interaction, but requires low privileges (PR:L), meaning the attacker needs some access to the Inforail Service rather than being fully unauthenticated.

Exploitation

Not listed in CISA KEV and no public exploit or ransomware use is documented in the record, but EPSS is high at roughly 0.62 (99th percentile), indicating elevated likelihood of exploitation activity.

What to do

  • Upgrade Ivanti Avalanche to 6.3.3 or later, per the vendor advisory.
  • Restrict network access to the Inforail Service to trusted hosts and segments.
  • Enforce least privilege and strong authentication for accounts that can reach the service.
  • Monitor and log deserialization errors or unusual process spawning on Avalanche servers.

Detection

  • Alert on unexpected child processes spawned by the Avalanche/Inforail service.
  • Monitor network connections to the Inforail Service from untrusted sources.
  • Review Avalanche and host logs for deserialization exceptions or anomalous service behavior.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://forums.ivanti.com/s/article/Security-Alert-CVE-s-Addressed-in-Avalanche-6-3-3 Vendor Advisory
https://forums.ivanti.com/s/article/Security-Alert-CVE-s-Addressed-in-Avalanche-6-3-3 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-42130), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.