# CVE-2017-7753: thunderbird: An out-of-bounds read occurs when applying style rules to pseudo-elements, such as ::first-line, using cached style data

CVE-2017-7753 is fixed in 8 products on 1 platform, first by thunderbird 1:52.4.0+build1-0ubuntu2, released October 1, 2017. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2017-7753
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0308
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 9, 2017

## Description

An out-of-bounds read occurs when applying style rules to pseudo-elements, such as ::first-line, using cached style data. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | thunderbird Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | [thunderbird 1:52.4.0+build1-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-52.4.0-build1-0ubuntu2.md) | Oct 1, 2017 |
| Linux | thunderbird-globalmenu Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | [thunderbird-globalmenu 1:52.4.0+build1-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-globalmenu-1-52.4.0-build1-0ubuntu2.md) | Oct 1, 2017 |
| Linux | thunderbird-gnome-support Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | [thunderbird-gnome-support 1:52.4.0+build1-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-52.4.0-build1-0ubuntu2.md) | Oct 1, 2017 |
| Linux | thunderbird-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | [thunderbird-mozsymbols 1:52.4.0+build1-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-52.4.0-build1-0ubuntu2.md) | Oct 1, 2017 |
| Linux | thunderbird-testsuite Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | [thunderbird-testsuite 1:52.4.0+build1-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-testsuite-1-52.4.0-build1-0ubuntu2.md) | Oct 1, 2017 |
| Linux | xul-ext-calendar-timezones Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | [xul-ext-calendar-timezones 1:52.4.0+build1-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-52.4.0-build1-0ubuntu2.md) | Oct 1, 2017 |
| Linux | xul-ext-gdata-provider Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | [xul-ext-gdata-provider 1:52.4.0+build1-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-52.4.0-build1-0ubuntu2.md) | Oct 1, 2017 |
| Linux | xul-ext-lightning Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | [xul-ext-lightning 1:52.4.0+build1-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-52.4.0-build1-0ubuntu2.md) | Oct 1, 2017 |

---

Data as of 2026-11-12T13:55:20Z 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.