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CVE-2017-7800
A use-after-free vulnerability can occur in WebSockets when the object holding the connection is freed before the disconnection operation…
Critical9.8EPSS 2.9%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
Description
A use-after-free vulnerability can occur in WebSockets when the object holding the connection is freed before the disconnection operation is finished. This results in an exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Critical9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 2.9% · top 13% of all CVEs (4 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
- Use-after-free in WebSockets during disconnection
- CWE-416 (opens in a new tab)All about CWE-416 and its CVEs
Affected products
- affected unspecified – < 52.3
- affected unspecified – < 52.3
- affected unspecified – < 55
References (11)
- https://www.mozilla.org/security/advisories/mfsa2017-19/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-20/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=1374047 (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-3968 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-18/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2017:2456 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2017:2534 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- 100196 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 1039124 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- GLSA-201803-14 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- DSA-3928 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2017-7800)Record last updated .