# CVE-2023-42793 — JetBrains TeamCity

**CISA KEV** · **Ransomware**

> As of 2025-10-21, CVE-2023-42793 is a CRITICAL-severity vulnerability in JetBrains TeamCity, CVSS v3.1 9.8, EPSS 99.9% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-10-04), with a US federal remediation deadline of 2023-10-25, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2023-42793, most recently “Edge Infrastructure Under Siege: Tenable and SentinelOne Datasets Reveal Convergent Nation-State and Criminal Exploitation of Perimeter Devices”.

**Last updated:** 2025-10-21

## What is CVE-2023-42793?

In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible

The record classifies CVE-2023-42793 under weakness class [CWE-288](https://intel.threadlinqs.com/cwe/CWE-288). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 1122 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 99.9% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
- **CISA KEV:** Listed since 2023-10-04, federal remediation deadline 2023-10-25 — used in known ransomware campaigns
- **Threadlinqs priority:** 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
- **Published:** 2023-09-19, last modified 2025-10-21

## Is CVE-2023-42793 being exploited?

CISA added CVE-2023-42793 to the Known Exploited Vulnerabilities catalog on 2023-10-04, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2023-10-25 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2023-42793 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (`http/cves/2023/CVE-2023-42793.yaml`). It currently carries a trending score of 50 in the Threadlinqs vulnerability feed.

- [H454NSec/CVE-2023-42793](https://github.com/H454NSec/CVE-2023-42793) (github)
- [B4l3rI0n/CVE-2023-42793](https://github.com/B4l3rI0n/CVE-2023-42793) (github)
- [Zenmovie/CVE-2023-42793](https://github.com/Zenmovie/CVE-2023-42793) (github)
- [hotplugin0x01/CVE-2023-42793](https://github.com/hotplugin0x01/CVE-2023-42793) (github)
- [junnythemarksman/CVE-2023-42793](https://github.com/junnythemarksman/CVE-2023-42793) (github)
- [hhesenjan/CVE-2023-42793](https://github.com/hhesenjan/CVE-2023-42793) (github)
- [SwiftSecur/teamcity-exploit-cve-2023-42793](https://github.com/SwiftSecur/teamcity-exploit-cve-2023-42793) (github)
- [syaifulandy/Nuclei-Template-CVE-2023-42793.yaml](https://github.com/syaifulandy/Nuclei-Template-CVE-2023-42793.yaml) (github)

## Affected products and versions

- [JetBrains](https://intel.threadlinqs.com/vendors/jetbrains): TeamCity

## How to fix CVE-2023-42793

Because CVE-2023-42793 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2023-10-25. No vendor patch reference has been recorded for CVE-2023-42793 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2023-42793

1 tracked threat in the Threadlinqs corpus references CVE-2023-42793, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Edge Infrastructure Under Siege: Tenable and SentinelOne Datasets Reveal Convergent Nation-State and Criminal Exploitation of Perimeter Devices](https://intel.threadlinqs.com/threat/TL-2026-2153) — HIGH · 2026-08-26

## Sources

Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [jetbrains.com](https://www.jetbrains.com/privacy-security/issues-fixed/)
- [blog.jetbrains.com](https://blog.jetbrains.com/teamcity/2023/09/cve-2023-42793-vulnerability-post-mortem/)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/174860/JetBrains-TeamCity-Unauthenticated-Remote-Code-Execution.html)
- [attackerkb.com](https://attackerkb.com/topics/1XEEEkGHzt/cve-2023-42793)
- [securityweek.com](https://www.securityweek.com/recently-patched-teamcity-vulnerability-exploited-to-hack-servers/)

_Showing 5 of 7 recorded references._

Canonical: https://intel.threadlinqs.com/cve/CVE-2023-42793
Full detection coverage and IOCs for threats exploiting CVE-2023-42793 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp