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CVE-2021-23758

86
FAUCET Score

CVE-2021-23758 is a critical deserialization vulnerability affecting all versions of the ajaxpro.2 package, allowing for remote code execution. With a CVSS score of 9.8 (CRITICAL), it can be exploited remotely without authentication or user interaction, leading to complete compromise of confidentiality, integrity, and availability. While not on CISA's KEV catalog, a Metasploit module exists for exploitation, and the vulnerability has garnered significant community discussion, indicating awareness and potential for active exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 21.10.30.1CPE matchmatch criteria
cpe:2.3:a:ajaxpro.2_project:ajaxpro.2:*:*:*:*:*:.net:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
88.77%
Probability of exploitation in next 30 days
EPSS Percentile
99.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Metasploit: AjaxPro Deserialization Remote Code Execution · Dec 3, 2021
This CVE's current EPSS score of 0.8877 is in the 99th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
nugetpatch availablevia ghsa
Product: AjaxNetProfessionalFixed in: 21.11.29.1

Vendor Advisories (1)

nugetGHSA-6r7c-6w96-8pvwcritical

Remote Code Execution in AjaxNetProfessional

Dec 7, 2021

References

packetstormsecurity.com / files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html
github.com / michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57
PatchThird Party Advisory
snyk.io / vuln/SNYK-DOTNET-AJAXPRO2-1925971
Third Party Advisory