In Varnish Cache before 6.6.2 and 7.x before 7.0.2, Varnish Cache 6.0 LTS before 6.0.10, and and Varnish Enterprise (Cache Plus) 4.1.x befor
In Varnish Cache before 6.6.2 and 7.x before 7.0.2, Varnish Cache 6.0 LTS before 6.0.10, and and Varnish Enterprise (Cache Plus) 4.1.x before 4.1.11r6 and 6.0.x before 6.0.9r4, request smuggling can occur for HTTP/1 connections.
- Published
- Jan 25, 2022
- Updated
- Jun 17, 2026
- EPSS
- 2.0% · 80th percentile
- CWE
- CWE-444
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Report tools
Action score
37
Monitor
Low priority for now.
- CVSS
- 36 / 40 · 9.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.0%
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| varnish-software | varnich cache | cpe:2.3:a:varnish-software:varnich_cache |
| varnish-software | varnish cache | cpe:2.3:a:varnish-software:varnish_cache |
| varnish-software | varnish cache plus | cpe:2.3:a:varnish-software:varnish_cache_plus |
| varnish cache project | varnish cache | cpe:2.3:a:varnish_cache_project:varnish_cache |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux10.0
- debian debian linux11.0
- debian debian linux9.0
- fedoraproject fedora35
- varnish cache project varnish cache7.0.0 and later · before 7.0.2
- varnish-software varnich cache1.0.0 and later · before 6.6.2
- varnish-software varnich cache4.1.1 and later · before 4.1.11r6
- varnish-software varnich cache4.1
- varnish-software varnish cache6.0.0 and later · before 6.0.10
- varnish-software varnish cache plus6.0.0 and later · before 6.0.9r4
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | varnish | before 6.0.8-1.module_el8.5.0+2620+03a0c2cc.1 | 6.0.8-1.module_el8.5.0+2620+03a0c2cc.1 |
| AlmaLinux:8 | varnish | before 6.0.8-1.module_el8.5.0+76+a10ffa55 | 6.0.8-1.module_el8.5.0+76+a10ffa55 |
| AlmaLinux:8 | varnish-devel | before 6.0.8-1.module_el8.5.0+76+a10ffa55 | 6.0.8-1.module_el8.5.0+76+a10ffa55 |
| AlmaLinux:8 | varnish-devel | before 6.0.8-1.module_el8.5.0+2620+03a0c2cc.1 | 6.0.8-1.module_el8.5.0+2620+03a0c2cc.1 |
| AlmaLinux:8 | varnish-docs | before 6.0.8-1.module_el8.5.0+76+a10ffa55 | 6.0.8-1.module_el8.5.0+76+a10ffa55 |
| AlmaLinux:8 | varnish-docs | before 6.0.8-1.module_el8.5.0+2620+03a0c2cc.1 | 6.0.8-1.module_el8.5.0+2620+03a0c2cc.1 |
| AlmaLinux:8 | varnish-modules | before 0.15.0-6.module_el8.5.0+76+a10ffa55 | 0.15.0-6.module_el8.5.0+76+a10ffa55 |
| AlmaLinux:8 | varnish-modules | before 0.15.0-6.module_el8.5.0+2620+03a0c2cc | 0.15.0-6.module_el8.5.0+2620+03a0c2cc |
| Alpine:v3.12 | varnish | before 6.5.2-r1 | 6.5.2-r1 |
| Alpine:v3.14 | varnish | before 6.6.2-r0 | 6.6.2-r0 |
| Alpine:v3.15 | varnish | before 7.0.2-r0 | 7.0.2-r0 |
| Debian:10 | varnish | before 6.1.1-1+deb10u3 | 6.1.1-1+deb10u3 |
| Debian:11 | varnish | before 6.5.1-1+deb11u2 | 6.5.1-1+deb11u2 |
| Debian:12 | varnish | before 7.1.0-5 | 7.1.0-5 |
| Debian:9 | varnish | before 5.0.0-7+deb9u3 | 5.0.0-7+deb9u3 |
| openSUSE:Tumbleweed | varnish | before 7.1.0-1.1 | 7.1.0-1.1 |
| openSUSE:Tumbleweed | vinyl-cache | before 9.0.0-1.1 | 9.0.0-1.1 |
| Red Hat:enterprise_linux:8::appstream | varnish | before 0:6.0.8-1.module+el8.5.0+14089+03a0c2cc.1 | 0:6.0.8-1.module+el8.5.0+14089+03a0c2cc.1 |
| Red Hat:enterprise_linux:8::appstream | varnish-devel | before 0:6.0.8-1.module+el8.5.0+14089+03a0c2cc.1 | 0:6.0.8-1.module+el8.5.0+14089+03a0c2cc.1 |
| Red Hat:enterprise_linux:8::appstream | varnish-docs | before 0:6.0.8-1.module+el8.5.0+14089+03a0c2cc.1 | 0:6.0.8-1.module+el8.5.0+14089+03a0c2cc.1 |
| Red Hat:enterprise_linux:8::appstream | varnish-modules | before 0:0.15.0-6.module+el8.5.0+11976+0b4af72d | 0:0.15.0-6.module+el8.5.0+11976+0b4af72d |
| Red Hat:enterprise_linux:8::appstream | varnish-modules-debuginfo | before 0:0.15.0-6.module+el8.5.0+11976+0b4af72d | 0:0.15.0-6.module+el8.5.0+11976+0b4af72d |
| Red Hat:enterprise_linux:8::appstream | varnish-modules-debugsource | before 0:0.15.0-6.module+el8.5.0+11976+0b4af72d | 0:0.15.0-6.module+el8.5.0+11976+0b4af72d |
| Red Hat:rhel_e4s:8.1::appstream | varnish | before 0:6.0.2-2.module+el8.1.0+14093+aa8ea65f.1 | 0:6.0.2-2.module+el8.1.0+14093+aa8ea65f.1 |
+23
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:varnish | 6.0.8-1.module_el8.5.0+2620+03a0c2cc.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:varnish-devel | 6.0.8-1.module_el8.5.0+76+a10ffa55 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:varnish-docs | 6.0.8-1.module_el8.5.0+2620+03a0c2cc.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:varnish-modules | 0.15.0-6.module_el8.5.0+2620+03a0c2cc · AlmaLinux:8 | Package registry (OSV) |
| alpine:varnish | 6.5.2-r1 · Alpine:v3.12 | Package registry (OSV) |
| debian:varnish | 7.1.0-5 · Debian:12 | Package registry (OSV) |
| opensuse:varnish | 7.1.0-bp153.2.3.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:vinyl-cache | 9.0.0-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:rh-varnish6-varnish | 0:6.0.8-2.el7.1 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-varnish6-varnish-devel | 0:6.0.8-2.el7.1 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-varnish6-varnish-docs | 0:6.0.8-2.el7.1 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-varnish6-varnish-libs | 0:6.0.8-2.el7.1 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:varnish | 0:6.0.8-1.module+el8.5.0+14089+03a0c2cc.1 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:varnish-devel | 0:6.0.8-1.module+el8.5.0+14089+03a0c2cc.1 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:varnish-docs | 0:6.0.8-1.module+el8.5.0+14089+03a0c2cc.1 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:varnish-modules | 0:0.15.0-6.module+el8.5.0+11976+0b4af72d · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:varnish-modules-debuginfo | 0:0.15.0-6.module+el8.5.0+11976+0b4af72d · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:varnish-modules-debugsource | 0:0.15.0-6.module+el8.5.0+11976+0b4af72d · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| rocky linux:varnish | 0:6.0.8-1.module+el8.5.0+736+fec10e21.1 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:varnish-modules | 0:0.15.0-6.module+el8.5.0+677+2a78a869 · Rocky Linux:8 | Package registry (OSV) |
| suse:varnish | 7.1.0-bp153.2.3.1 · SUSE:Package Hub 15 SP3 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-22-0113 · Feb 4, 2022(RedHat Güvenlik Güncellemesi)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- None
Weakness class (CWE)
CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- docs.varnish-software.com/security/VSV00008/
- lists.debian.org/debian-lts-announce/2022/02/msg00014.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UMMDMQWNAE3BTSZUHXQHVAMZC5TLHLYT/
- varnish-cache.org/security/VSV00008.html
- www.debian.org/security/2022/dsa-5088
Vendor advisories and official records. Exploit/PoC links are deliberately left out.