# RHSA-2021:4292: Security update for 3 packages

RHSA-2021:4292, released November 9, 2021, fixes 7 CVEs across 3 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2021-4292
- Platform: Linux
- Released: Nov 9, 2021
- Priority: High (Closes CVE-2021-31806, high severity)
- CVEs: 7, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2021:4292

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libecap](https://patchblox.com/security/data/product/linux/libecap.md) | RHEL 8 | 0:1.0.1-2.module+el8.1.0+4044+36416a77 |
| [libecap-devel](https://patchblox.com/security/data/product/linux/libecap-devel.md) | RHEL 8 | 0:1.0.1-2.module+el8.1.0+4044+36416a77 |
| [squid](https://patchblox.com/security/data/product/linux/squid.md) | RHEL 8 | 7:4.15-1.module+el8.5.0+11469+24c223d9 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-31806](https://patchblox.com/security/data/cve/CVE-2021-31806.md) | High | squid: An issue was discovered in Squid before 4.15 and 5.x before 5.0.6 | 7.4 | 0.9533 |  |
| [CVE-2021-33620](https://patchblox.com/security/data/cve/CVE-2021-33620.md) | High | squid: Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause adenial of service (affecting availability to a... | 7.4 | 0.7958 |  |
| [CVE-2021-28662](https://patchblox.com/security/data/cve/CVE-2021-28662.md) | High | libecap: Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.  The... | 7.4 | 0.7176 |  |
| [CVE-2021-31807](https://patchblox.com/security/data/cve/CVE-2021-31807.md) | High | squid-openssl: An issue was discovered in Squid before 4.15 and 5.x before 5.0.6 | 7.4 | 0.1556 |  |
| [CVE-2021-28651](https://patchblox.com/security/data/cve/CVE-2021-28651.md) | High | libecap: Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.  The... | 7.4 | 0.0745 |  |
| [CVE-2021-31808](https://patchblox.com/security/data/cve/CVE-2021-31808.md) | High | squid: An issue was discovered in Squid before 4.15 and 5.x before 5.0.6 | 7.4 | 0.0534 |  |
| [CVE-2021-28652](https://patchblox.com/security/data/cve/CVE-2021-28652.md) | High | libecap: Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.  The... | 7.4 | 0.0434 |  |

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Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo