CVE-2021-23758

Act now ● On CISA KEV — actively exploited

Actively exploited — on the CISA KEV list.

CVSS base

8.1 HIGH

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

EPSS — probability of exploitation (30 days)

83.6%

99.7th percentile

CISA KEV

Listed

Added 2026-08-26 · patch by 2026-09-09

Weakness / dates

CWE-502

Published 2021-12-03 · modified 2026-08-27

CVSS breakdown

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

Attack Vector	N	Network
Attack Complexity	H	High
Privileges Required	N	None
User Interaction	N	None
Scope	U	Unchanged
Confidentiality	H	High
Integrity	H	High
Availability	H	High

Timeline

2021-12-03 — Published (NVD)
2026-08-26 — Added to CISA KEV (actively exploited)
2026-09-09 — CISA patch-by deadline
2026-08-27 — Last modified (NVD)

Description

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.

Affected

ajaxpro.2_project michaelschwarz

References

Official: NVD · CVE.org