An exposed dangerous function vulnerability exists in Ivanti Avalanche before 6.3.3 allows an attacker with access to the Inforail Service…

published 2021-12-07 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-29118

cvss: 8.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.9%; EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits: 0; none known

An exposed dangerous function vulnerability exists in Ivanti Avalanche before 6.3.3 allows an attacker with access to the Inforail Service to perform an arbitrary file write.

Patch / fix

fixed in 1

ivanti avalanche 6.3.3

Exploit prediction

2.90% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
NVD	2.0	5.5	AV:N/AC:L/Au:S/C:N/I:P/A:P

Affected products

n/a Ivanti Avalanche

Classification

Weakness

CWE-434 Unrestricted Upload of File with Dangerous Type
CWE-829 Inclusion of Functionality from Untrusted Control Sphere

Technology feeds

Ivanti rss critical rss

References

forums.ivanti.com /s/article/Security-Alert-CVE-s-Addressed-in-Avalanche-6-3-3
vendor-advisory

Sources

CVE List CVE-2021-42133
NVD CVE-2021-42133

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary