Vulnerability-Lookup

RHSA-2025:8350

Vulnerability from csaf_redhat - Published: 2025-06-02 03:04 - Updated: 2026-07-12 02:17

Summary

Red Hat Security Advisory: varnish security update

Severity

Important

Notes

Topic: An update for varnish is now available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: 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.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2025-47905

A vulnerability was found in Varnish Cache. This vulnerability may allow request smuggling attacks, where a malicious actor can craft seemingly legitimate HTTP requests. This issue could result in an unspecified system caching incorrect content that can expose confidential information.

8.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Affected products

Fixed 10 products

Product	Version	Remediation
Unresolved product id: AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.i686	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

8 references

URL	Category
https://access.redhat.com/errata/RHSA-2025:8350	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2364235	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2025-47905	self
https://bugzilla.redhat.com/show_bug.cgi?id=2364235	external
https://www.cve.org/CVERecord?id=CVE-2025-47905	external
https://nvd.nist.gov/vuln/detail/CVE-2025-47905	external

JSON

To clipboard

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      "cve": "CVE-2025-47905",
      "cwe": {
        "id": "CWE-444",
        "name": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)"
      },
      "discovery_date": "2025-05-05T20:49:45.130000+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2364235"
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      "notes": [
        {
          "category": "description",
          "text": "A vulnerability was found in Varnish Cache. This vulnerability may allow request smuggling attacks, where a malicious actor can craft seemingly legitimate HTTP requests. This issue could result in an unspecified system caching incorrect content that can expose confidential information.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "varnish: request smuggling attacks",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated as an IMPORTANT severity because this is a client-side desync vulnerability in Varnish handling a chunked transfer encoding, where it mishandles CRLF delimiters, allows attackers to smuggle additional HTTP/1 requests, this flaw allows attacker to unauthorized access of sensitive information and data alteration.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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      "product_status": {
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-47905"
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          "summary": "RHBZ#2364235",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2364235"
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-47905",
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      "release_date": "2025-05-13T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-06-02T03:04:25+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.aarch64",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.i686",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.ppc64le",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.s390x",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.src",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.x86_64",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.aarch64",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.ppc64le",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.s390x",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2025:8350"
        },
        {
          "category": "workaround",
          "details": "Currently, no mitigation is available for this vulnerability.",
          "product_ids": [
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.aarch64",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.i686",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.ppc64le",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.s390x",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.src",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.x86_64",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.aarch64",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.ppc64le",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.s390x",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.aarch64",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.i686",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.ppc64le",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.s390x",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.src",
            "AppStream-9.0.0.Z.E4S:varnish-0:6.6.2-2.el9_0.4.x86_64",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.aarch64",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.ppc64le",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.s390x",
            "AppStream-9.0.0.Z.E4S:varnish-docs-0:6.6.2-2.el9_0.4.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "varnish: request smuggling attacks"
    }
  ]
}

CVE-2025-47905 (GCVE-0-2025-47905)

Vulnerability from cvelistv5 – Published: 2025-05-13 00:00 – Updated: 2025-05-29 09:03

Summary

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.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-05-14 14:15 UTC

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Assigner

mitre CNA under the mitre root

CNA scorecard E 28/100 over 2325 records in the last 180 days details

References

3 references

URL	Tags
https://varnish-cache.org/security/VSV00016.html
http://www.openwall.com/lists/oss-security/2025/05/15/2
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

1 product

Vendor	Product	Version
varnish-software	Varnish Cache	Affected: 0 , < 6.0.14 LTS (custom) Affected: 7.0.0 , < 7.6.3 (custom) Affected: 7.7.0 , < 7.7.1 (custom) cpe:2.3:a:varnish-software:varnish_cache:::::::: cpe:2.3:a:varnish-software:varnish_cache:::::::: cpe:2.3:a:varnish-software:varnish_cache::::::::

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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