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CVE-2016-5824

19
FAUCET Score

CVE-2016-5824 describes a use-after-free vulnerability in libical 1.0, affecting products from Canonical and Red Hat. This flaw allows remote attackers to trigger a denial of service by providing a specially crafted .ics file. With a CVSS score of 5.5 (Medium), it requires user interaction (UI:R) and local access (AV:L) for an attacker to successfully exploit, leading to high availability impact (A:H). There is no evidence of active exploitation, nor are there publicly available exploits in Metasploit or ExploitDB, and it has garnered minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
1.0CPE matchmatch criteria
cpe:2.3:a:libical_project:libical:1.0:*:*:*:*:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
18.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
18.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.5MEDIUM

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.11%
Probability of exploitation in next 30 days
EPSS Percentile
79.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0211 is in the 90th percentile among its peer group of 5,758 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:60.5.0-1.el6_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: thunderbird-0:60.5.0-1.el7_6
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird

Vendor Advisories (1)

redhatCVE-2016-5824Moderate

libical: Multiple use-after-free vulnerabilities

May 24, 2016

References

access.redhat.com / errata/RHSA-2019:0269
Third Party Advisory
access.redhat.com / errata/RHSA-2019:0270
Third Party Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue Tracking
github.com / libical/libical/issues/235
Issue TrackingPatchThird Party Advisory
github.com / libical/libical/issues/251
Issue TrackingPatchThird Party Advisory
github.com / libical/libical/issues/286
Issue TrackingPatchThird Party Advisory
security.gentoo.org / glsa/201904-02
security.gentoo.org / glsa/201904-07
usn.ubuntu.com / 3897-1
Third Party Advisory
openwall.com / lists/oss-security/2016/06/25/4
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2017/01/20/16
Mailing ListPatchThird Party Advisory
securityfocus.com / bid/91459
Third Party AdvisoryVDB Entry