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.

Published: 2025-05-13 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-47905 is rated Moderate Risk (40.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.29%). 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-2025-47905

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 2026-03-09 0.06% 0.29% +0.23%
2 2026-01-27 0.03% 0.06% +0.02%
3 2025-11-21 — 0.03% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-47905

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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: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.
 2.2 2.7 [email protected]

Weakness enumeration for CVE-2025-47905

OS Trackers for CVE-2025-47905

vendor priority summary link
alpine medium CVE-2025-47905: 1 source package rows (varnish); 3 state rows across 3 repos (3.21-main, 3.22-main, edge-main); fixed 3, open 0. https://security.alpinelinux.org/vuln/CVE-2025-47905
debian not yet assigned CVE-2025-47905 not yet assigned priority: Debian including 1 source packages (varnish), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-47905
redhat high — https://access.redhat.com/security/cve/CVE-2025-47905
ubuntu medium CVE-2025-47905 medium priority: Ubuntu including 1 source packages (varnish), 10 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 6, ignored 2, not-affected 1, released 1. https://ubuntu.com/security/CVE-2025-47905

Affected software / configurations for CVE-2025-47905

Vendor Product Version Raw CPE
varnish-software varnish_cache < 6.0.14 LTS cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:*
varnish-software varnish_cache >= 7.0.0, < 7.6.3 cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:*
varnish-software varnish_cache >= 7.7.0, < 7.7.1 cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:*

References for CVE-2025-47905

cvelogic Threat Intelligence