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Fencer Vulns
medium 5.5

CVE-2016-5824 json

libical 1.0 allows remote attackers to cause a denial of service (use-after-free) via a crafted ics file.

published 2017-01-27 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-6759

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

libical 1.0 allows remote attackers to cause a denial of service (use-after-free) via a crafted ics file.

Patch / fix

  • thunderbird Debian 14, Debian 13, Debian 12 1:60.5.0-1

debian advisories DEBIAN-CVE-2016-5824

  • thunderbird Ubuntu 14.04 LTS 1:60.5.1+build2-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:60.5.1+build2-0ubuntu0.16.04.1
  • thunderbird Ubuntu 18.04 LTS 1:60.5.1+build2-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2016-5824

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 7 60.5.0-1.el7_6
  • thunderbird RHEL 6 60.5.0-1.el6_10

red hat advisories RHSA-2019:0270RHSA-2019:0269

  • MozillaThunderbird SLE Workstation Extension 15 60.5.0-3.20.2
  • libical SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 0.43-1.10.6.1
  • libical SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +6 more 1.0.1-16.3.1

suse advisories SUSE-SU-2019:0338-1SUSE-SU-2018:0119-1SUSE-SU-2017:1989-1

  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 60.5.1-79.1

opensuse advisories openSUSE-SU-2024:10601-1openSUSE-SU-2019:0249-1

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-2016-5824 updated cvss 5.5

libical: Multiple use-after-free vulnerabilities

  • Red Hat Enterprise Linux 5 thunderbird
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) thunderbird 60.5.0-1.el7_6
    fixed: vendor fix RHSA-2019:0270
  • Red Hat Enterprise Linux Desktop (v. 6) thunderbird 60.5.0-1.el6_10
    fixed: vendor fix RHSA-2019:0269
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 60.5.0-1.el7_6
    fixed: vendor fix RHSA-2019:0270
  • Red Hat Enterprise Linux Server Optional (v. 6) thunderbird 60.5.0-1.el6_10
    fixed: vendor fix RHSA-2019:0269
  • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 60.5.0-1.el7_6
    fixed: vendor fix RHSA-2019:0270
  • Red Hat Enterprise Linux Workstation (v. 6) thunderbird 60.5.0-1.el6_10
    fixed: vendor fix RHSA-2019:0269
  • Red Hat Enterprise Linux Workstation (v. 7) thunderbird 60.5.0-1.el7_6
    fixed: vendor fix RHSA-2019:0270
show 1 more
  • Red Hat Enterprise Linux 6 libical Red Hat Enterprise Linux 7 libical, libical-glib, compat-libical1 Red Hat Enterprise Linux 8 thunderbird
    not affected: vulnerable code not present

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

2.17% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

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.