# RHSA-2021:1853: Security update for 4 packages

RHSA-2021:1853, released May 18, 2021, fixes 11 CVEs across 4 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2021-1853
- Platform: Linux
- Released: May 18, 2021
- Priority: High (Closes CVE-2019-25042, high severity)
- CVEs: 11, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2021:1853

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [python3-unbound](https://patchblox.com/security/data/product/linux/python3-unbound.md) | RHEL 8 | 0:1.7.3-15.el8 |
| [unbound](https://patchblox.com/security/data/product/linux/unbound.md) | RHEL 8 | 0:1.7.3-15.el8 |
| [unbound-devel](https://patchblox.com/security/data/product/linux/unbound-devel.md) | RHEL 8 | 0:1.7.3-15.el8 |
| [unbound-libs](https://patchblox.com/security/data/product/linux/unbound-libs.md) | RHEL 8 | 0:1.7.3-15.el8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2019-25032](https://patchblox.com/security/data/cve/CVE-2019-25032.md) | High | python3-unbound: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver | 9.8 | 0.0288 |  |
| [CVE-2019-25034](https://patchblox.com/security/data/cve/CVE-2019-25034.md) | High | python3-unbound: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver | 9.8 | 0.0288 |  |
| [CVE-2019-25035](https://patchblox.com/security/data/cve/CVE-2019-25035.md) | High | python3-unbound: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver | 9.8 | 0.0288 |  |
| [CVE-2019-25039](https://patchblox.com/security/data/cve/CVE-2019-25039.md) | High | python3-unbound: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver | 9.8 | 0.0288 |  |
| [CVE-2019-25042](https://patchblox.com/security/data/cve/CVE-2019-25042.md) | High | python3-unbound: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver | 9.8 | 0.0288 |  |
| [CVE-2019-25038](https://patchblox.com/security/data/cve/CVE-2019-25038.md) | High | python3-unbound: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver | 9.8 | 0.0282 |  |
| [CVE-2019-25037](https://patchblox.com/security/data/cve/CVE-2019-25037.md) | High | python3-unbound: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver | 7.5 | 0.0216 |  |
| [CVE-2019-25041](https://patchblox.com/security/data/cve/CVE-2019-25041.md) | High | python3-unbound: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver | 7.5 | 0.0216 |  |
| [CVE-2019-25036](https://patchblox.com/security/data/cve/CVE-2019-25036.md) | High | python3-unbound: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver | 9.8 | 0.0207 |  |
| [CVE-2019-25040](https://patchblox.com/security/data/cve/CVE-2019-25040.md) | High | python3-unbound: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver | 7.5 | 0.0207 |  |
| [CVE-2020-28935](https://patchblox.com/security/data/cve/CVE-2020-28935.md) | Routine | python3-unbound: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver | 5.5 | 0.0049 |  |

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Data as of 2026-11-07T12:40:37Z 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