An out of bounds read error occurs when parsing some HTTP digest authorization responses, resulting in information leakage through the read…

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-14522

cvss: 5.3; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits: 0; none known

An out of bounds read error occurs when parsing some HTTP digest authorization responses, resulting in information leakage through the reading of random memory containing matches to specifically set patterns. This vulnerability affects Firefox < 52 and Thunderbird < 52.

Patch / fix

fixed in 2 distros 3 links 1

Mozilla Firefox 52
Mozilla Thunderbird 52

ubuntu opensuse arch linux

firefox Ubuntu 14.04 LTS 52.0+build2-0ubuntu0.14.04.1
firefox Ubuntu 16.04 LTS 52.0+build2-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2017-5418

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 92.0-1.2
MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
MozillaThunderbird Package Hub 12 52.1.0-30.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:10600-1 openSUSE-SU-2024:10601-1 openSUSE-SU-2017:1268-1

firefox Arch Linux 52.0-1

arch linux advisories AVG-194

bugzilla.mozilla.org/show_bug.cgi?id=1338876 advisory

Exploit prediction

1.23% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1338876 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

Mozilla Firefox
Mozilla Thunderbird

Classification

Weakness

CWE-125 Out-of-bounds Read

References

bugzilla.mozilla.org /show_bug.cgi?id=1338876
exploit, issue-tracking, patch, vendor-advisory
mozilla.org /security/advisories/mfsa2017-09/
vendor-advisory
mozilla.org /security/advisories/mfsa2017-05/
vendor-advisory
securitytracker.com /id/1037966
vdb-entry, third-party-advisory
securityfocus.com /bid/96692
vdb-entry, third-party-advisory

Sources

CVE List CVE-2017-5418
NVD CVE-2017-5418

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary