CVE-2021-23758

Deserialization of Untrusted Data

At a glance

Severity: HIGH 8.1
Exploitation: Known exploited (CISA KEV) · added 2026-08-26
Exploited per ENISA since 2026-08-26
EPSS: EPSS 82.58 % · percentile 100 (2026-10-27)
State: PUBLISHED
Published: 2021-12-03
Updated: 2026-08-27
Assigner: snyk
NVD status: Analyzed

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	snyk
CVSS 3.1	HIGH 8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · report@snyk.io (Secondary)
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)
CVSS 2.0	HIGH 7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

CWE-502

Advisories

GHSA-6r7c-6w96-8pvw — Remote Code Execution in AjaxNetProfessional

European references

ENISA EUVD · EUVD-2021-2466
GCVE · GCVE-0-2021-23758

Affected configurations (NVD CPE)

cpe:2.3:a:ajaxpro.2_project:ajaxpro.2:*:*:*:*:*:.net:*:*
cpe:2.3:a:michaelschwarz:ajax.net_professional:*:*:*:*:*:.net:*:* < 21.10.30.1

Affected products

Product	Versions
AjaxPro.2	affected 0 < unspecified

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
CISA Known Exploited Vulnerabilities	CC0 1.0
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD