# ELSA-2021-9552: Security update for 2 packages

ELSA-2021-9552, released November 19, 2021, fixes 2 CVEs across 2 products. One of them is being exploited (CVE-2020-11023); 1 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/linux/elsa-2021-9552
- Platform: Linux
- Released: Nov 19, 2021
- Priority: Patch now (Closes CVE-2020-11023, exploited (CISA KEV))
- CVEs: 2, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://linux.oracle.com/errata/ELSA-2021-9552.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [pcs](https://patchblox.com/security/data/product/linux/pcs.md) | ol 8 | 0:0.10.10-4.0.1.el8 |
| [pcs-snmp](https://patchblox.com/security/data/product/linux/pcs-snmp.md) | ol 8 | 0:0.10.10-4.0.1.el8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-11023](https://patchblox.com/security/data/cve/CVE-2020-11023.md) | Patch now | apache-commons-collections: The Public Key Infrastructure (PKI) Core contains fundamental packages required by Red Hat Certificate System.  Secur... | 6.1 | 0.8489 | CISA KEV |
| [CVE-2020-7656](https://patchblox.com/security/data/cve/CVE-2020-7656.md) | Routine | pcs: The pcs packages provide a command-line configuration system for the Pacemaker and Corosync utilities.  The following... | 6.1 | 0.0643 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo