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Fencer Intel
medium 5.3

CVE-2017-7829 json

It is possible to spoof the sender's email address and display an arbitrary sender address to the email recipient.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16804

cvss
5.3
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

It is possible to spoof the sender's email address and display an arbitrary sender address to the email recipient. The real sender's address is not displayed if preceded by a null character in the display string. This vulnerability affects Thunderbird < 52.5.2.

Patch / fix

  • Mozilla Thunderbird 52.5.2
  • thunderbird Debian 14, Debian 13, Debian 12 1:52.5.2-1

debian advisories DEBIAN-CVE-2017-7829

  • thunderbird Ubuntu 14.04 LTS 1:52.6.0+build1-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:52.6.0+build1-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2017-7829

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

  • thunderbird RHEL 6 52.5.2-1.el6_9
  • thunderbird RHEL 7 52.5.2-1.el7_4

red hat advisories RHSA-2018:0061

  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 52.5.2-51.1

opensuse advisories openSUSE-SU-2024:10601-1openSUSE-SU-2017:3433-1openSUSE-SU-2017:3434-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-7829 updated cvss 5.3

Mozilla: From address with encoded null character is cut off in message header display

  • Red Hat Enterprise Linux Client (v. 7) thunderbird 52.5.2-1.el7_4 Red Hat Enterprise Linux Desktop (v. 6) thunderbird 52.5.2-1.el6_9 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 52.5.2-1.el7_4 Red Hat Enterprise Linux Server Optional (v. 6) thunderbird 52.5.2-1.el6_9 Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 52.5.2-1.el7_4 Red Hat Enterprise Linux Workstation (v. 6) thunderbird 52.5.2-1.el6_9
    +1 more products
    Red Hat Enterprise Linux Workstation (v. 7) thunderbird 52.5.2-1.el7_4
    fixed: vendor fix RHSA-2018:0061

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.76% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1423432 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:N/I:L/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

  • Mozilla Thunderbird

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel 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.