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CVE-2017-7805
During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer. This saved data is used for later messages but…
High7.5EPSS 3.0%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
Description
During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer. This saved data is used for later messages but in some cases, the handshake transcript can exceed the space available in the current buffer, causing the allocation of a new buffer. This leaves a pointer pointing to the old, freed buffer, resulting in a use-after-free when handshake hashes are then calculated afterwards. This can result in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 3.0% · top 12% of all CVEs (3 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
- Use-after-free in TLS 1.2 generating handshake hashes
- CWE-416 (opens in a new tab)All about CWE-416 and its CVEs
Affected products
- affected unspecified – < 56
- affected unspecified – < 52.4
- affected unspecified – < 52.4
References (13)
- RHSA-2017:2832 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- 101059 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- [debian-lts-announce] 20171101 [SECURITY] [DLA 1153-1] icedove/thunderbird security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-22/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=1377618 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1039465 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-21/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-4014 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.mozilla.org/security/advisories/mfsa2017-23/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-3998 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- DSA-3987 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- GLSA-201803-14 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_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)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2017-7805)Record last updated .