CVE-2023-6378Network attack vector

Logging interruption via unbounded object deserialization

Published Nov 29, 2023 · Updated Nov 29, 2024

Deserialization in QOS.ch Logback before 1.2.13, 1.3.0 through 1.3.11, and 1.4.0 through 1.4.11 allows remote attackers to interrupt logging. HardenedObjectInputStream deserializes attacker-controlled object graphs without array-size or depth limits, while LoggingEventVO accepts an unbounded argument-array length. Exploitation requires an enabled receiver component that is reachable by the attacker, and successful input can slow or stop centralized event logging.

CVSS severity7.1
High
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in QOS.ch Logback before 1.2.13, 1.3.0 through 1.3.11, and 1.4.0 through 1.4.11 allows remote attackers to interrupt logging. HardenedObjectInputStream deserializes attacker-controlled object graphs without array-size or depth limits, while LoggingEventVO accepts an unbounded argument-array length. Exploitation requires an enabled receiver component that is reachable by the attacker, and successful input can slow or stop centralized event logging.

The record

CVE
CVE-2023-6378
Published
Nov 29, 2023
Updated
Nov 29, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 29, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.1GitHub Advisory DatabaseCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

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.

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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-502Deserialization of Untrusted Data
T1499.004Application or System Exploitation

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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