CVE-2025-47905VulnerabilityPublished 2 Jun 2025Updated 11 Oct 2026

SUSE · security update for varnish

Affects SUSESource GCVE Database

Not known to be exploited.

Data as of 25 Oct 2026, 19:02 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.3% chance of exploitation in 30 days – higher than 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 2 Jun 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
SUSE Product Security Team SUSE	Affected Red Hat Red Hat Enterprise Linux Red Hat Enterprise Linux AppStream EUS (v.8.8) src varnish-0:6.0.8-3.module+el8.8.0+23121+d8c7990e.3.src::varnish:6 SUSE i686 varnish-0:6.6.2-6.el9_6.1.i686 varnish-devel-0:6.6.2-6.el9_6.1.i686 x86_64	Fixed in–

AI-suggested

Red Hat has released updated varnish:6 packages for Red Hat Enterprise Linux 8.8 Extended Update Support that fix this vulnerability. Users should apply the security update as detailed in the Red Hat advisory RHSA-2025:8294 and the referenced article https://access.redhat.com/articles/11258. Since this is an official fix, applying the update fully mitigates the vulnerability.

Description

Varnish Cache is a high-performance HTTP accelerator. It stores web pages in memory so web servers don't have to create the same web page over and over again, giving the website a significant speed up. Security Fix(es): * varnish: request smuggling attacks (CVE-2025-47905) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Impact

The vulnerability enables request smuggling attacks against Varnish Cache, potentially allowing attackers to interfere with HTTP request processing. This could lead to security issues such as bypassing security controls or causing unexpected behavior in web applications relying on Varnish. The severity is rated as high by the source data, indicating a significant security impact if exploited.

Summary

CVE-2025-47905 is a vulnerability in Varnish Cache related to request smuggling attacks. Varnish Cache accelerates HTTP traffic by caching web pages in memory. The vulnerability allows an attacker to perform request smuggling, which can interfere with the processing of HTTP requests. Red Hat Product Security has rated this update as Important and released a security advisory (RHSA-2025:8294) providing updated varnish:6 packages for Red Hat Enterprise Linux 8.8 Extended Update Support to remediate the issue.

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') (opens in a new tab)
Base weaknessOWASP Top 10 A06:2025: Insecure Design (opens in a new tab)
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
Implementation
Use a web server that employs a strict HTTP parsing procedure, such as Apache.
Implementation
Use only SSL communication.
Implementation
Terminate the client session after each request.
OWASP Cheat Sheets
REST Assessment (opens in a new tab)
REST Security (opens in a new tab)
Cross-Site Request Forgery Prevention (opens in a new tab)
Secure Design Principles (opens in a new tab)
OWASP ASVS 4.0.3
V13.2.5 (opens in a new tab)
Attack patterns
HTTP Response Smuggling (opens in a new tab)
HTTP Request Smuggling (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Jul 2026, 10:17 UTC

WeaknessesCWE-444

Technical details

References

Community reviews

Related threats