An issue was discovered in Varnish Cache before 6.0.4 LTS, and 6.1.x and 6.2.x before 6.2.1.
An issue was discovered in Varnish Cache before 6.0.4 LTS, and 6.1.x and 6.2.x before 6.2.1. An HTTP/1 parsing failure allows a remote attacker to trigger an assert by sending crafted HTTP/1 requests. The assert will cause an automatic restart with a clean cache, which makes it a Denial of Service attack.
- Published
- Sep 3, 2019
- Updated
- Jun 16, 2026
- EPSS
- 5.9% · 93th percentile
- CWE
- CWE-617
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Report tools
Action score
32
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 2 / 30 · 5.9%
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 | varnish cache | cpe:2.3:a:varnish-software:varnish_cache |
| varnish cache project | varnish cache | cpe:2.3:a:varnish_cache_project:varnish_cache |
| 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
- varnish cache project varnish cache6.1.0 and later · up to 6.1.1 inclusive
- varnish cache project varnish cache6.2.0 and later · before 6.2.1
- varnish-software varnish cache6.0.0 and later · before 6.0.4
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | varnish | before 6.2.1-r0 | 6.2.1-r0 |
| Alpine:v3.8 | varnish | before 6.0.4-r0 | 6.0.4-r0 |
| Debian:10 | varnish | before 6.1.1-1+deb10u1 | 6.1.1-1+deb10u1 |
| Debian:12 | varnish | before 6.2.1-1 | 6.2.1-1 |
| openSUSE:Leap 15.0 | varnish | before 6.2.1-lp151.3.3.1 | 6.2.1-lp151.3.3.1 |
| openSUSE:Tumbleweed | varnish | before 6.6.1-1.2 | 6.6.1-1.2 |
| openSUSE:Tumbleweed | vinyl-cache | before 9.0.0-1.1 | 9.0.0-1.1 |
| Red Hat:enterprise_linux:8::appstream | varnish | before 0:6.0.6-2.module+el8.3.0+6843+b3b42fcc | 0:6.0.6-2.module+el8.3.0+6843+b3b42fcc |
| Red Hat:enterprise_linux:8::appstream | varnish-devel | before 0:6.0.6-2.module+el8.3.0+6843+b3b42fcc | 0:6.0.6-2.module+el8.3.0+6843+b3b42fcc |
| Red Hat:enterprise_linux:8::appstream | varnish-docs | before 0:6.0.6-2.module+el8.3.0+6843+b3b42fcc | 0:6.0.6-2.module+el8.3.0+6843+b3b42fcc |
| Red Hat:enterprise_linux:8::appstream | varnish-modules | before 0:0.15.0-5.module+el8.3.0+6843+b3b42fcc | 0:0.15.0-5.module+el8.3.0+6843+b3b42fcc |
| Red Hat:enterprise_linux:8::appstream | varnish-modules-debuginfo | before 0:0.15.0-5.module+el8.3.0+6843+b3b42fcc | 0:0.15.0-5.module+el8.3.0+6843+b3b42fcc |
| Red Hat:enterprise_linux:8::appstream | varnish-modules-debugsource | before 0:0.15.0-5.module+el8.3.0+6843+b3b42fcc | 0:0.15.0-5.module+el8.3.0+6843+b3b42fcc |
| Red Hat:rhel_software_collections:3::el7 | rh-varnish6 | before 0:4.1-6.el7 | 0:4.1-6.el7 |
| Red Hat:rhel_software_collections:3::el7 | rh-varnish6-runtime | before 0:4.1-6.el7 | 0:4.1-6.el7 |
| Red Hat:rhel_software_collections:3::el7 | rh-varnish6-scldevel | before 0:4.1-6.el7 | 0:4.1-6.el7 |
| Red Hat:rhel_software_collections:3::el7 | rh-varnish6-varnish | before 0:6.0.6-1.el7 | 0:6.0.6-1.el7 |
| Red Hat:rhel_software_collections:3::el7 | rh-varnish6-varnish-devel | before 0:6.0.6-1.el7 | 0:6.0.6-1.el7 |
| Red Hat:rhel_software_collections:3::el7 | rh-varnish6-varnish-docs | before 0:6.0.6-1.el7 | 0:6.0.6-1.el7 |
| Red Hat:rhel_software_collections:3::el7 | rh-varnish6-varnish-libs | before 0:6.0.6-1.el7 | 0:6.0.6-1.el7 |
| Red Hat:rhel_software_collections:3::el7 | rh-varnish6-varnish-modules | before 0:0.15.0-6.el7 | 0:0.15.0-6.el7 |
| Red Hat:rhel_software_collections:3::el7 | rh-varnish6-varnish-modules-debuginfo | before 0:0.15.0-6.el7 | 0:0.15.0-6.el7 |
| Rocky Linux:8 | varnish | before 0:6.0.6-2.module+el8.3.0+179+20b582cc | 0:6.0.6-2.module+el8.3.0+179+20b582cc |
| Rocky Linux:8 | varnish-modules | before 0:0.15.0-5.module+el8.3.0+179+20b582cc | 0:0.15.0-5.module+el8.3.0+179+20b582cc |
+1
Same product
varnish-software: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-45060An HTTP Request Forgery issue was discovered in Varnish Cache 5.x and 6.x before 6.0.11, 7.x before 7.1.2, and 7.2.x before 7.2.1.30Monitor
- CVE-2025-47905Varnish 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, beca21Monitor
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 |
|---|---|---|
| alpine:varnish | 6.2.1-r0 · Alpine:v3.10 | Package registry (OSV) |
| debian:varnish | 6.2.1-1 · Debian:12 | Package registry (OSV) |
| opensuse:varnish | 6.2.1-lp151.3.3.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:vinyl-cache | 9.0.0-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:rh-varnish6 | 0:4.1-6.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-varnish6-runtime | 0:4.1-6.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-varnish6-scldevel | 0:4.1-6.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-varnish6-varnish | 0:6.0.6-1.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-varnish6-varnish-devel | 0:6.0.6-1.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-varnish6-varnish-docs | 0:6.0.6-1.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-varnish6-varnish-libs | 0:6.0.6-1.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-varnish6-varnish-modules | 0:0.15.0-6.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-varnish6-varnish-modules-debuginfo | 0:0.15.0-6.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:varnish | 0:6.0.6-2.module+el8.3.0+6843+b3b42fcc · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:varnish-devel | 0:6.0.6-2.module+el8.3.0+6843+b3b42fcc · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:varnish-docs | 0:6.0.6-2.module+el8.3.0+6843+b3b42fcc · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| rocky linux:varnish | 0:6.0.6-2.module+el8.3.0+179+20b582cc · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:varnish-modules | 0:0.15.0-5.module+el8.3.0+179+20b582cc · Rocky Linux:8 | Package registry (OSV) |
| suse:varnish | 6.2.1-bp151.4.3.1 · SUSE:Package Hub 15 | 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-19-132 · Sep 5, 2019(Varnish 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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-617 · Reachable AssertionCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.opensuse.org/opensuse-security-announce/2019-09/msg00069.html
- lists.opensuse.org/opensuse-security-announce/2019-09/msg00089.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3OEOCYRU43TWEU2C65F3D6GK64MSWNNK/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DBAQF6UDRSTURGINIMSMLJR4PTDYWA7C/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KLSF54TDJWJLINIFEW5V5BKDNY5EQRR3/
- seclists.org/bugtraq/2019/Sep/5
- varnish-cache.org/security/VSV00003.html
- www.debian.org/security/2019/dsa-4514
Vendor advisories and official records. Exploit/PoC links are deliberately left out.