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Fencer Vulns
critical 9.1

CVE-2019-17362 json

In LibTomCrypt through 1.18.2, the der_decode_utf8_string function (in der_decode_utf8_string.c) does not properly detect certain invalid U…

published 2019-10-09 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-7770

cvss
9.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

In LibTomCrypt through 1.18.2, the der_decode_utf8_string function (in der_decode_utf8_string.c) does not properly detect certain invalid UTF-8 sequences. This allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) or read information from other memory locations via carefully crafted DER-encoded data.

Patch / fix

  • libtomcrypt Debian 14, Debian 13, Debian 12 1.18.2-3

debian advisories DEBIAN-CVE-2019-17362

  • libtomcrypt Ubuntu Pro 14.04 LTS 1.17-5ubuntu0.1+esm1
  • libtomcrypt Ubuntu Pro 16.04 LTS 1.17-7ubuntu0.1+esm1
  • libtomcrypt Ubuntu Pro 18.04 LTS 1.18.1-1ubuntu0.1+esm1

ubuntu advisories UBUNTU-CVE-2019-17362

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

  • libtomcrypt SLED 12 SP4, SLE Workstation Extension 12 SP5, SLE Workstation Extension 12 SP4 1.17-3.3.1

suse advisories SUSE-SU-2019:3095-1

  • libtomcrypt openSUSE Leap 15.1 1.17-lp151.3.3.1
  • libtomcrypt openSUSE Leap 15.0 1.17-lp150.2.3.1

opensuse advisories openSUSE-SU-2019:2514-1openSUSE-SU-2019:2454-1

  • perl-cryptx Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 0.079-r0

alpine advisories ALPINE-CVE-2019-17362

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libtomcrypt CBL-Mariner 2.0, Azure Linux 3.0 1.18.2-9

azure linux advisories AZL-36958AZL-7275

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2019-17362 updated cvss 6.5

libtomcrypt: out-of-bounds read in the der_decode_utf8_string function in der_decode_utf8_string.c

  • Red Hat CloudForms Management Engine 5 libtomcrypt Red Hat Ansible Engine 2 libtomcrypt
    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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

3.11% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/libtom/libtomcrypt/issues/507 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.1 CVSS:3.1/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 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.