An issue was discovered in Varnish Cache before 6.0.4 LTS, and 6.1.x and 6.2.x before…
Priority MEDIUM 42CWE-617Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-617.
Summary
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.
Why it matters now
EPSS 0.059 93rd percentileScored 2026-11-07
Fix Fixed Red Hat: 1 advisory
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:lts:*:*:* | 6.0.0 to before 6.0.4 | Vulnerable | varnish-software |
| cpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:* | 6.1.0 – 6.1.1; 6.2.0 to before 6.2.1 | Vulnerable | Varnish Cache Project |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
- cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:lts:*:*:* Versions 6.0.0 to before 6.0.4 Vulnerable ·varnish-software
- cpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:* Versions 6.1.0 – 6.1.1; 6.2.0 to before 6.2.1 Vulnerable ·Varnish Cache Project
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
Remediation
Red Hat 1 advisory
- RHSA-2020:4756 Released 2020-11-04 · Red Hat rating Moderatevarnish:6 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 8) varnish-6.0.6-2.module+el8.3.0+6843+b3b42fcc.aarch64::varnish:6, varnish-6.0.6-2.module+el8.3.0+6843+b3b42fcc.ppc64le::varnish:6, varnish-6.0.6-2.module+el8.3.0+6843+b3b42fcc.s390x::varnish:6 +15
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2020:4756 |
| Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) | Fixed | — |
| Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) | Fixed | — |
| Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) | Fixed | — |
| Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) | Fixed | — |
Not affected: 1 product
- Red Hat Software Collections
Timeline
- 2026-10-02 Threatist record created from CVE-2019-15892
- 2026-10-03 Alias added: GHSA-3775-frgh-j3vc
References
Sources
- CVE-2019-15892 · CVE Program
- CVE-2019-15892 · NVD
- FIRST EPSS
- GHSA-3775-frgh-j3vc · GitHub Advisory Database · CC BY 4.0
- CVE-2019-15892 · Red Hat security data · CC BY 4.0
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