CVE-2023-6481 | Logback "receiver" DOS vulnerability CVE-2023-6378 incomplete fix

A serialization vulnerability in logback receiver component part of logback version 1.4.13, 1.3.13 and 1.2.12 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.

Published: 2023-12-04 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-6481 is rated Moderate Risk (42.7/100): CVSS High severity, with low exploitation likelihood (EPSS 0.19%). 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-2023-6481

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 2025-10-17 0.32% 0.19% -0.13%
2 2025-05-15 0.23% 0.32% +0.09%
3 2025-03-30 — 0.23% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-6481

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-2023-6481

GitHub Security Advisory for CVE-2023-6481

GHSA-gm62-rw4g-vrc4 · Severity: high · Ecosystem: maven — Logback is vulnerable to an attacker mounting a Denial-Of-Service attack by sending poisoned data

OS Trackers for CVE-2023-6481

vendor priority summary link
debian unimportant CVE-2023-6481 unimportant priority: Debian including 1 source packages (logback), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2023-6481
redhat medium — https://access.redhat.com/security/cve/CVE-2023-6481
ubuntu medium CVE-2023-6481 medium priority: Ubuntu including 1 source packages (logback), 11 status rows across 11 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, trusty, upstream, xenial): not-affected 8, ignored 3. https://ubuntu.com/security/CVE-2023-6481

Affected software / configurations for CVE-2023-6481

Vendor Product Version Raw CPE
qos logback 1.2.12 cpe:2.3:a:qos:logback:1.2.12:*:*:*:*:*:*:*
qos logback 1.3.13 cpe:2.3:a:qos:logback:1.3.13:*:*:*:*:*:*:*
qos logback 1.4.13 cpe:2.3:a:qos:logback:1.4.13:*:*:*:*:*:*:*

References for CVE-2023-6481

cvelogic Threat Intelligence