# CVE-2021-20314: libmail-spf-xs-perl: Stack buffer overflow in libspf2 versions below 1.2.11 when processing certain SPF macros can lead to Denial of servi...

CVE-2021-20314 is fixed in 3 products on 1 platform, first by libmail-spf-xs-perl 1.2.10-7ubuntu0.18.04.1~esm1, released January 19, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-20314
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0283
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 10, 2021

## Description

Stack buffer overflow in libspf2 versions below 1.2.11 when processing certain SPF macros can lead to Denial of service and potentially code execution via malicious crafted SPF explanation messages.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libmail-spf-xs-perl Ubuntu 18.04.6 LTS (bionic) | 1.2.10-7ubuntu0.18.04.1~esm1 | [libmail-spf-xs-perl 1.2.10-7ubuntu0.18.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libmail-spf-xs-perl-1.2.10-7ubuntu0.18.04.1-esm1.md) | Jan 19, 2022 |
| Linux | libmail-spf-xs-perl Ubuntu 20.04 LTS (focal) | 1.2.10-7+deb9u2build0.20.04.1 | [libmail-spf-xs-perl 1.2.10-7+deb9u2build0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libmail-spf-xs-perl-1.2.10-7-deb9u2build0.20.04.1.md) | Jan 19, 2022 |
| Linux | libspf2-2 Ubuntu 18.04.6 LTS (bionic) | 1.2.10-7ubuntu0.18.04.1~esm1 | [libspf2-2 1.2.10-7ubuntu0.18.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libspf2-2-1.2.10-7ubuntu0.18.04.1-esm1.md) | Jan 19, 2022 |
| Linux | libspf2-2 Ubuntu 20.04 LTS (focal) | 1.2.10-7+deb9u2build0.20.04.1 | [libspf2-2 1.2.10-7+deb9u2build0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libspf2-2-1.2.10-7-deb9u2build0.20.04.1.md) | Jan 19, 2022 |
| Linux | spfquery Ubuntu 18.04.6 LTS (bionic) | 1.2.10-7ubuntu0.18.04.1~esm1 | [spfquery 1.2.10-7ubuntu0.18.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-spfquery-1.2.10-7ubuntu0.18.04.1-esm1.md) | Jan 19, 2022 |
| Linux | spfquery Ubuntu 20.04 LTS (focal) | 1.2.10-7+deb9u2build0.20.04.1 | [spfquery 1.2.10-7+deb9u2build0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-spfquery-1.2.10-7-deb9u2build0.20.04.1.md) | Jan 19, 2022 |

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Data as of 2026-11-09T07:25:28Z 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

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