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CVE-2023-42793

Exploited in the wild. In CISA KEV since 2023‑10‑04. Fixed in 2023.05.4.

CVSS 3.19.8CriticalEPSS percentile99th100% chance in 30 daysCISA KEVListedsince 2023-10-04, due 2023-10-25
Public exploit: 3 sourcesFix2023.05.4Upgrade to this build

Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • JetBrains TeamCityAffected: < 2023.05.4Upgrade to: 2023.05.4Stated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

Check it yourselfA free Nuclei and OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Discuss checks for your systems with a specialist. Scope is agreed before testing.

Coverage timeline

1 publisher

  1. ESET observed Lazarus-linked Operation DreamJob targeting European UAV-related companies using social-engineering and trojanized open-source projects to deploy the ScoringMathTea RAT.

    ·ESET WeLiveSecurity

  2. Added to CISA KEV catalog

    ·CISA KEV

Sourced from public security reporting — each date is when it was published, not when it happened. 1 further article named this CVE in wider roundups without reporting it as a distinct event.

What it is

From the CVE record

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

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS99th
Public exploit
CISA KEV
CISA KEV

Listed as exploited in the wild since 2023-10-04.

US federal agencies must remediate by 2023-10-25.

Known use in ransomware campaigns.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Public exploits

3 sources with a proof of concept or module.

Exploit links, PoCs and Metasploit modules after sign-in
EPSS

100% chance of exploitation activity in the next 30 days, which ranks it in the 99th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

The patch came 133 days before any public exploit.

  1. Analysis publishedJetBrains TeamCity's unauthenticated 9.8: CVE-2026-63077 turns the channel you trust into RCE
  2. OpenVAS check added
  3. Public exploit / PoCsource: packetstormnuclei check added
  4. Patch availablerecord updated
  5. Added to CISA KEVransomware campaign
  6. Publishedweakness classified, att&ck mapped

Affected products

And 1 more affected product. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 9.8 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 11 more references. See all after sign-in

Analysis on the cve.tools blog

In the news

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next exploited one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for TeamCity, not every advisory. This one: actively exploited.