Arbitrary file upload in Ivanti Avalanche

CVE-2021-42125

An unrestricted file upload vulnerability exists in Ivanti Avalanche before 6.3.3 allows an attacker with access to the Inforail Service to write dangerous files.

Vulnerability class: Insecure Deserialization

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.816 (99.6th percentile), scored .

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.6% 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-2021-42125: held from 0.816 to 0.816.

EPSS over last 30 days · oldest: 0.816 · newest: 0.816 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-42125?
CVE-2021-42125 is a high-severity vulnerability in Ivanti Avalanche, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2021-12-07.
How severe is CVE-2021-42125?
High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2021-42125 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.