CVE-2023-41104

libvmod-digest before 1.0.3, as used in Varnish Enterprise 6.0.x before 6.0.11r5, has an out-of-bounds memory access during base64 decoding, leading to both authentication bypass and information disclosure; however, the exact attack surface will depend on the particular VCL (Varnish Configuration Language) configuration in use.

Published: 2023-08-23 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-41104 is rated Low Risk (39.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.18%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2023-41104

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 2025-11-21 0.34% 0.18% -0.16%
2 2025-11-18 0.18% 0.34% +0.16%
3 2025-04-15 — 0.18% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-41104

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N 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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 2.5 [email protected]

Weakness enumeration for CVE-2023-41104

Affected software / configurations for CVE-2023-41104

Vendor Product Version Raw CPE
varnish-software varnish_enterprise >= 6.0.0, < 6.0.11 cpe:2.3:a:varnish-software:varnish_enterprise:*:*:*:*:*:*:*:*
varnish-software varnish_enterprise 6.0.11 cpe:2.3:a:varnish-software:varnish_enterprise:6.0.11:-:*:*:*:*:*:*
varnish-software varnish_enterprise 6.0.11 cpe:2.3:a:varnish-software:varnish_enterprise:6.0.11:r1:*:*:*:*:*:*
varnish-software varnish_enterprise 6.0.11 cpe:2.3:a:varnish-software:varnish_enterprise:6.0.11:r2:*:*:*:*:*:*
varnish-software varnish_enterprise 6.0.11 cpe:2.3:a:varnish-software:varnish_enterprise:6.0.11:r3:*:*:*:*:*:*
varnish-software varnish_enterprise 6.0.11 cpe:2.3:a:varnish-software:varnish_enterprise:6.0.11:r4:*:*:*:*:*:*
varnish-software vmod_digest < 1.0.3 cpe:2.3:a:varnish-software:vmod_digest:*:*:*:*:*:*:*:*

References for CVE-2023-41104

cvelogic Threat Intelligence