Arbitrary file upload in Ivanti Avalanche

CVE-2021-42133

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.

Vulnerability class: Unrestricted File Upload

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.028 (86.0th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-42133: held from 0.028 to 0.028.

EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-42133?
CVE-2021-42133 is a high-severity vulnerability in Ivanti Avalanche, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.1/10. Published 2021-12-07.
How severe is CVE-2021-42133?
High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2021-42133 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.