CVE-2023-6378 | Logback "receiver" DOS vulnerability

A serialization vulnerability in logback receiver component part of logback version 1.4.11 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.

Published: 2023-11-29 Last update: 2024-11-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-6378 is rated Moderate Risk (53/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.61%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-6378

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-04 0.36% 0.61% +0.25%
2 2026-03-01 0.61% 0.36% -0.25%
3 2026-02-04 — 0.61% —

Full EPSS history (43 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-6378

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.5 4.0 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2023-6378

GitHub Security Advisory for CVE-2023-6378

GHSA-vmq6-5m68-f53m · Severity: high · Ecosystem: maven — logback serialization vulnerability

OS Trackers for CVE-2023-6378

vendor priority summary link
debian not yet assigned CVE-2023-6378 not yet assigned priority: Debian including 1 source packages (logback), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2023-6378
redhat medium — https://access.redhat.com/security/cve/CVE-2023-6378
ubuntu medium CVE-2023-6378 medium priority: Ubuntu including 1 source packages (logback), 12 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): released 5, not-affected 4, ignored 3. https://ubuntu.com/security/CVE-2023-6378

Affected software / configurations for CVE-2023-6378

Vendor Product Version Raw CPE
qos logback >= 1.2.0, < 1.2.13 cpe:2.3:a:qos:logback:*:*:*:*:*:*:*:*
qos logback >= 1.3.0, < 1.3.12 cpe:2.3:a:qos:logback:*:*:*:*:*:*:*:*
qos logback >= 1.4.0, < 1.4.12 cpe:2.3:a:qos:logback:*:*:*:*:*:*:*:*

References for CVE-2023-6378

cvelogic Threat Intelligence