# ELSA-2021-4409: Security update for 2 packages

ELSA-2021-4409, released November 16, 2021, fixes 1 CVE across 2 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/elsa-2021-4409
- Platform: Linux
- Released: Nov 16, 2021
- Priority: High (Closes CVE-2021-33560, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://linux.oracle.com/errata/ELSA-2021-4409.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libgcrypt](https://patchblox.com/security/data/product/linux/libgcrypt.md) | ol 8 | 0:1.8.5-6.el8 |
| [libgcrypt-devel](https://patchblox.com/security/data/product/linux/libgcrypt-devel.md) | ol 8 | 0:1.8.5-6.el8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-33560](https://patchblox.com/security/data/cve/CVE-2021-33560.md) | High | Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm and the window size is not chosen appropriately. This for example affects use of ElGamal in OpenPGP. | 7.5 | 0.0237 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo