VDB
ALPINE-CVE-2019-12521
ALPINE-CVE-2019-12521
PUBLISHED
CVSS 5.900000095367432 MEDIUM
An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.
Risk Scores
CVSS 3.1
5.900000095367432
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.11 | squid | 2.7.6-r10, 3.0, 3.2.0.12-r3 |
| Alpine:v3.10 | squid | 3.0, 2.7.6-r1, 2.7.6-r10 |
| Alpine:v3.9 | squid | 3.0, 3.2.0.12-r3, 3.2.0.12-r1 |
Timeline
- Apr 15, 2020 CVE Published
- Jul 8, 2026 CVE Updated
- Aug 8, 2026 Distribution Patch