CVE-2021-23758KEV · OVERDUECWE-502insecure-deserialization

Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

High · published December 4, 2021

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.1. It is confirmed in active exploitation. It sits in the 99.7th percentile for exploit probability.

45
days past CISA
deadline
CVSS v3.1
8.1
EPSS
83%
Percentile
99.7
In the wild
Confirmed
What it is

All versions of package ajaxpro.2 are vulnerable to Deserialization of Untrusted Data due to the possibility of deserialization of arbitrary .NET classes, which can be abused to gain remote code execution.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.82578 · 99.7th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2021-12-04T01:15Z
KEV added
2026-08-26 · due 2026-09-09
Affected products (2)
ProductVersionsFixed in
ajaxpro.2_project/ajaxpro.2all versions—
michaelschwarz/ajax.net_professional< 21.10.30.121.10.30.1
References (8)
EPSS history
Timeline
  • 26 AUG 00:00Z
    Added to CISA KEV — remediate by Sep 9
    kev
  • 03 DEC 20:05Z
    Deserialization of Untrusted Data
    cvelistv5