# libgcrypt20 1.8.1-4ubuntu1.3: libgcrypt20 1.8.1-4ubuntu1.3 for Ubuntu 18.04.6 LTS (bionic)

libgcrypt20 1.8.1-4ubuntu1.3, released September 6, 2021, fixes 2 CVEs in libgcrypt20. None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/linux/ubuntu-bionic-libgcrypt20-1.8.1-4ubuntu1.3
- Platform: Linux
- Released: Sep 6, 2021
- Priority: High (Closes CVE-2021-33560, high severity)
- CVEs: 2, exploited: 0, on CISA KEV: 0

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libgcrypt20](https://patchblox.com/security/data/product/linux/libgcrypt20.md) | Ubuntu 18.04.6 LTS (bionic) | 1.8.1-4ubuntu1.3 |

## 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 |  |
| [CVE-2021-40528](https://patchblox.com/security/data/cve/CVE-2021-40528.md) | Routine | libgcrypt20: The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintextrecovery because, during interaction between two... | 5.9 | 0.0142 |  |

---

Data as of 2026-11-11T13:47:35Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.