CVE Details
CVE-2021-23758
Ajax.NET Professional Deserialization of Untrusted Data Vulnerability
Published: 2026-08-26
CVSS: 8.1 HIGH
Product: Ajax.NET Professional Ajax.NET Professional
Due Date: 2026-09-09
Ajax.NET Professional (AjaxPro) contains a deserialization of untrusted data vulnerability that could allow for remote code execution via arbitrary .NET classes. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.
GitHub PoC
Warning: GitHub PoC repositories are unverified. Some may be fake
or contain malware. Use caution and review code before running anything.
FIRST EPSS
EPSS estimates the probability of exploitation in the next 30 days. Higher values indicate higher likelihood of real-world exploitation.
Timeline
CVE Stalker
KEV
MITRE
GitHub
FIRST (EPSS)
MITRE
CVSS
SSVC
References
Show Raw Data
| Key | Remaining Key | Value |
|---|---|---|
| dataType | CVE_RECORD | |
| dataVersion | 5.2 | |
| cveMetadata > | state | PUBLISHED |
| cveMetadata > | cveId | CVE-2021-23758 |
| cveMetadata > | assignerOrgId | bae035ff-b466-4ff4-94d0-fc9efd9e1730 |
| cveMetadata > | assignerShortName | snyk |
| cveMetadata > | dateUpdated | 2026-08-26T17:44:58.213Z |
| cveMetadata > | dateReserved | 2021-01-08T00:00:00.000Z |
| cveMetadata > | datePublished | 2021-12-03T20:05:12.932Z |
| containers > | cna > title | Deserialization of Untrusted Data |
| containers > | cna > datePublic | 2021-12-03T00:00:00.000Z |
| containers > | cna > providerMetadata > orgId | bae035ff-b466-4ff4-94d0-fc9efd9e1730 |
| containers > | cna > providerMetadata > shortName | snyk |
| containers > | cna > providerMetadata > dateUpdated | 2023-11-14T03:06:35.776Z |
| containers > | cna > descriptions > 0 > lang | en |
| containers > | cna > descriptions > 0 > value | 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. |
| containers > | cna > affected > 0 > vendor | n/a |
| containers > | cna > affected > 0 > product | AjaxPro.2 |
| containers > | cna > affected > 0 > versions > 0 > version | 0 |
| containers > | cna > affected > 0 > versions > 0 > status | affected |
| containers > | cna > affected > 0 > versions > 0 > lessThan | unspecified |
| containers > | cna > affected > 0 > versions > 0 > versionType | custom |
| containers > | cna > references > 0 > url | https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971 |
| containers > | cna > references > 1 > url | https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57 |
| containers > | cna > references > 2 > url | http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html |
| containers > | cna > credits > 0 > lang | en |
| containers > | cna > credits > 0 > value | Hans-Martin Münch (MOGWAI LABS) |
| containers > | cna > metrics > 0 > cvssV3_1 > version | 3.1 |
| containers > | cna > metrics > 0 > cvssV3_1 > vectorString | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| containers > | cna > metrics > 0 > cvssV3_1 > attackVector | NETWORK |
| containers > | cna > metrics > 0 > cvssV3_1 > attackComplexity | HIGH |
| containers > | cna > metrics > 0 > cvssV3_1 > privilegesRequired | NONE |
| containers > | cna > metrics > 0 > cvssV3_1 > userInteraction | NONE |
| containers > | cna > metrics > 0 > cvssV3_1 > scope | UNCHANGED |
| containers > | cna > metrics > 0 > cvssV3_1 > confidentialityImpact | HIGH |
| containers > | cna > metrics > 0 > cvssV3_1 > integrityImpact | HIGH |
| containers > | cna > metrics > 0 > cvssV3_1 > availabilityImpact | HIGH |
| containers > | cna > metrics > 0 > cvssV3_1 > baseScore | 8.1 |
| containers > | cna > metrics > 0 > cvssV3_1 > baseSeverity | HIGH |
| containers > | cna > problemTypes > 0 > descriptions > 0 > type | text |
| containers > | cna > problemTypes > 0 > descriptions > 0 > lang | en |
| containers > | cna > problemTypes > 0 > descriptions > 0 > description | Deserialization of Untrusted Data |
| containers > | adp > 0 > providerMetadata > orgId | af854a3a-2127-422b-91ae-364da2661108 |
| containers > | adp > 0 > providerMetadata > shortName | CVE |
| containers > | adp > 0 > providerMetadata > dateUpdated | 2024-08-03T19:14:09.129Z |
| containers > | adp > 0 > title | CVE Program Container |
| containers > | adp > 0 > references > 0 > url | https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971 |
| containers > | adp > 0 > references > 0 > tags > 0 | x_transferred |
| containers > | adp > 0 > references > 1 > url | https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57 |
| containers > | adp > 0 > references > 1 > tags > 0 | x_transferred |
| containers > | adp > 0 > references > 2 > url | http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html |
| containers > | adp > 0 > references > 2 > tags > 0 | x_transferred |
| containers > | adp > 1 > metrics > 0 > other > type | ssvc |
| containers > | adp > 1 > metrics > 0 > other > content > id | CVE-2021-23758 |
| containers > | adp > 1 > metrics > 0 > other > content > role | CISA Coordinator |
| containers > | adp > 1 > metrics > 0 > other > content > options > 0 > Exploitation | active |
| containers > | adp > 1 > metrics > 0 > other > content > options > 1 > Automatable | no |
| containers > | adp > 1 > metrics > 0 > other > content > options > 2 > Technical Impact | total |
| containers > | adp > 1 > metrics > 0 > other > content > version | 2.0.3 |
| containers > | adp > 1 > metrics > 0 > other > content > timestamp | 2026-08-26T17:44:04.350622Z |
| containers > | adp > 1 > references > 0 > url | https://blog.talosintelligence.com/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-compromise-operations/ |
| containers > | adp > 1 > references > 0 > tags > 0 | third-party-advisory |
| containers > | adp > 1 > references > 1 > url | https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-23758 |
| containers > | adp > 1 > references > 1 > tags > 0 | government-resource |
| containers > | adp > 1 > problemTypes > 0 > descriptions > 0 > lang | en |
| containers > | adp > 1 > problemTypes > 0 > descriptions > 0 > type | CWE |
| containers > | adp > 1 > problemTypes > 0 > descriptions > 0 > cweId | CWE-502 |
| containers > | adp > 1 > problemTypes > 0 > descriptions > 0 > description | CWE-502 Deserialization of Untrusted Data |
| containers > | adp > 1 > title | CISA ADP Vulnrichment |
| containers > | adp > 1 > providerMetadata > orgId | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| containers > | adp > 1 > providerMetadata > shortName | CISA-ADP |
| containers > | adp > 1 > providerMetadata > dateUpdated | 2026-08-26T17:44:58.213Z |