CVE-2021-23758

HIGHNVD 8.19.0▲

8.1

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.

CVSS v3: 8.1
EG Score: 9.0(high)
EPSS: 99.5%
KEV: Not listed

Published

December 3, 2021

Last Modified

November 21, 2024

References (6)

report@snykhttp://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html
report@snykhttps://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57
report@snykhttps://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html
af854a3a-2127-422b-91ae-364da2661108https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57
af854a3a-2127-422b-91ae-364da2661108https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971

Affected Packages

(1 across 1 ecosystem)

NuGet(1)

Package	Vulnerable range	Fixed in	Dependents
AjaxNetProfessional	21.10.30, 21.11.22, 21.11.29	21.11.29.1	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-502Deserialization of Untrusted Data

Data Freshness Timeline

(refreshed 2× in last 7d / 2× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-26 06:55 UTCEG score recompute

Frequently asked(5)

What is CVE-2021-23758?

CVE-2021-23758 is a high vulnerability published on December 3, 2021. 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.

When was CVE-2021-23758 disclosed?

CVE-2021-23758 was first published in the National Vulnerability Database on December 3, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-23758 actively exploited?

CVE-2021-23758 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-23758?

CVE-2021-23758 has a CVSS v3 base score of 8.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.

How do I remediate CVE-2021-23758?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-23758, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-23758

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