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Fencer Intel
critical 9.1

CVE-2016-9584 json

libical allows remote attackers to cause a denial of service (use-after-free) and possibly read heap memory via a crafted ics file.

published 2017-01-18 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-10390

cvss
9.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

libical allows remote attackers to cause a denial of service (use-after-free) and possibly read heap memory via a crafted ics file.

Patch / fix

  • libical3 Debian 14, Debian 13, Debian 12 3.0.1-1

debian advisories DEBIAN-CVE-2016-9584

  • 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-2018:0119-1SUSE-SU-2017:1989-1

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-2016-9584 updated cvss 9.1

libical: Use-after-free

  • Red Hat Enterprise Linux 6 libical Red Hat Enterprise Linux 7 libical, libical-glib, compat-libical1
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 5 thunderbird Red Hat Enterprise Linux 6 thunderbird Red Hat Enterprise Linux 7 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

2.32% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P

Classification

Weakness

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.