How severe is CVE-2023-41104?

CVE-2023-41104 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2023-41104 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-41104?

CVE-2023-41104 primarily affects Varnish-software Varnish Enterprise. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-41104?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-41104 published?

CVE-2023-41104 was published on 2023-08-23 and last updated on 2026-06-17.

CVE-2023-41104

CVE-2023-41104 is a medium-severity vulnerability in Varnish-software Varnish Enterprise with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Varnish-software Varnish Enterprise
Published: 2023-08-23
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2023-41104?: CVE-2023-41104 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2023-41104 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-41104?: CVE-2023-41104 primarily affects Varnish-software Varnish Enterprise. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-41104?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-41104 published?: CVE-2023-41104 was published on 2023-08-23 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:a:varnish-software:varnish_enterprise:*:*:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.11:-:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.11:r1:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.11:r2:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.11:r3:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.11:r4:*:*:*:*:*:*
cpe:2.3:a:varnish-software:vmod_digest:*:*:*:*:*:*:*:*

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