Vulnerability in Varnish-software Varnish Cache
CVE-2025-47905
Varnish Cache before 7.6.3 and 7.7 before 7.7.1, and Varnish Enterprise before 6.0.13r14, allow client-side desync via HTTP/1 requests, because the product incorrectly permits CRLF to be skipped to delimit chunk boundaries.
Vulnerability class: HTTP Request Smuggling
EPSS: 0.003 (52.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Varnish-software Varnish Cache — versions 0, 7.0.0, 7.7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2025-47905?
- CVE-2025-47905 is a medium-severity vulnerability in Varnish-software Varnish Cache, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.4/10. Published 2025-05-13.
- How severe is CVE-2025-47905?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2025-47905 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.