CVE-2024-35299Network attack vector

SMTPS traffic disclosure via missing hostname validation

Published May 16, 2024 · Updated Aug 2, 2024

Improper certificate validation in JetBrains YouTrack before 2024.1.29548 allows man-in-the-middle attackers to read SMTPS traffic. The SMTPS client fails to compare the mail server certificate's hostname with the configured SMTP host, so a valid certificate for another host is accepted. Exploitation requires a network position between a YouTrack server configured for SMTPS and its mail server; the published impact is limited to confidentiality.

CVSS severity5.9
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in JetBrains YouTrack before 2024.1.29548 allows man-in-the-middle attackers to read SMTPS traffic. The SMTPS client fails to compare the mail server certificate's hostname with the configured SMTP host, so a valid certificate for another host is accepted. Exploitation requires a network position between a YouTrack server configured for SMTPS and its mail server; the published impact is limited to confidentiality.

The record

CVE
CVE-2024-35299
Published
May 16, 2024
Updated
Aug 2, 2024
Vendor
JetBrains
Product
YouTrack
Classifications
CWE-295, CAPEC-475, CAPEC-459, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2024.1.29548

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

JetBrains · YouTrackversion=0 <2024.1.29548

Published CVSS scores

5.9JetBrains s.r.o.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
CAPEC-475Signature Spoofing by Improper Validation
CAPEC-459Creating a Rogue Certification Authority Certificate
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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