varnish: Missing check for integer overflow when handling chunk sizes in HTTP requests
Published Aug 4, 2017
7.5
HIGHCVSS 3.0
EPSS 2.42%
Description
An issue was discovered in Varnish HTTP Cache 4.0.1 through 4.0.4, 4.1.0 through 4.1.7, 5.0.0, and 5.1.0 through 5.1.2. A wrong if statement in the varnishd source code means that particular invalid requests from the client can trigger an assert, related to an Integer Overflow. This causes the varnishd worker process to abort and restart, losing the cached contents in the process. An attacker can therefore crash the varnishd worker process on demand and effectively keep it from serving content - a Denial-of-Service attack. The specific source-code filename containing the incorrect statement varies across releases.
Affected products
No data.
Configuration 1
- 4.0.2
- 4.0.3
- 4.0.3
- 4.0.3
- 4.0.3
- 4.0.1
- 4.0.2
- 4.0.3
- 4.0.4
Configuration 2
- 4.1.0
- 4.1.0
- 4.1.0
- 4.1.1
- 4.1.1
- 4.1.1
- 4.1.2
- 4.1.2
- 4.1.2
- 4.1.3
- 4.1.3
- 4.1.3
- 4.1.4
- 4.1.4
- 4.1.4
- 4.1.4
- 4.1.5
- 4.1.5
- 4.1.5
- 4.1.6
- 4.1.7
Configuration 3
- 5.0.0
- 5.1.0
- 5.1.1
- 5.1.2
No data.
Red Hat Software Collections
rh-varnish4-varnish
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Software Collections | rh-varnish4-varnish | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.42% (0.02416) | 83.55th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.42% (0.02416) | 81.95th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.83% (0.00828) | 72.33th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.69% (0.02689) | 76.39th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.60% (0.00604) | 78.74th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.60% (0.00604) | 77.85th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.60% (0.00604) | 75.22th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.11% (0.01108) | 29.61th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.45% (0.01454) | 32.67th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.45% (0.01454) | 0.00th | v1 |
References (10)
- http://www.debian.org/security/2017/dsa-3924 vendor-advisoryx_refsource_DEBIAN
- https://access.redhat.com/security/cve/CVE-2017-12425 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1477222 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1051917 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://github.com/varnishcache/varnish-cache/issues/2379 x_refsource_CONFIRMThird Party Advisory
- https://lists.debian.org/debian-security-announce/2017/msg00186.html x_refsource_CONFIRMMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-12425
- https://www.cve.org/CVERecord?id=CVE-2017-12425
- https://www.varnish-cache.org/security/VSV00001.html
- https://www.varnish-cache.org/security/VSV00001.html#vsv00001 x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.debian.org/security/2017/dsa-3924 | vendor-advisoryx_refsource_DEBIAN | |
| https://access.redhat.com/security/cve/CVE-2017-12425 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1477222 | x_refsource_CONFIRMIssue TrackingThird Party Advisory | |
| https://bugzilla.suse.com/show_bug.cgi?id=1051917 | x_refsource_CONFIRMIssue TrackingThird Party Advisory | |
| https://github.com/varnishcache/varnish-cache/issues/2379 | x_refsource_CONFIRMThird Party Advisory | |
| https://lists.debian.org/debian-security-announce/2017/msg00186.html | x_refsource_CONFIRMMailing ListThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-12425 | ||
| https://www.cve.org/CVERecord?id=CVE-2017-12425 | ||
| https://www.varnish-cache.org/security/VSV00001.html | ||
| https://www.varnish-cache.org/security/VSV00001.html#vsv00001 | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.