CVE-2023-45613Network attack vector

Traffic interception via unverified server certificates

Published Oct 9, 2023 · Updated Sep 18, 2024

Improper certificate validation in JetBrains Ktor before 2.3.5 allows man-in-the-middle attackers to read or modify HTTPS traffic. JetBrains states that server certificates were not verified but has not disclosed the affected client engine, code locus, or failed validation operation. Exploitation requires an affected application to initiate a TLS connection across an attacker-controlled network path, exposing the connection's confidentiality and integrity.

CVSS severity6.8
Medium
EPSS probability0.30%
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 Ktor before 2.3.5 allows man-in-the-middle attackers to read or modify HTTPS traffic. JetBrains states that server certificates were not verified but has not disclosed the affected client engine, code locus, or failed validation operation. Exploitation requires an affected application to initiate a TLS connection across an attacker-controlled network path, exposing the connection's confidentiality and integrity.

The record

CVE
CVE-2023-45613
Published
Oct 9, 2023
Updated
Sep 18, 2024
Vendor
JetBrains
Product
Ktor
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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 <2.3.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

JetBrains · Ktorversion=0 <2.3.5

Published CVSS scores

6.8JetBrains s.r.o.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
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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