CVE-2019-18934

Name: CVE-2019-18934
Creator: NVD / NIST
Published: 2019-11-19T18:15:10.523+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.3/10EPSS 3.21%

Last modified Jun 17, 2026

CVE-2019-18934 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. Unbound 1.6.4 through 1.9.4 contain a vulnerability in the ipsec module that can cause shell code execution after receiving a specially crafted answer. This issue can only be triggered if unbound was compiled with `--enable-ipsecmod` support, and ipsecmod is enabled and used in the configuration.. EPSS estimates a 3.21% chance of exploitation in the next 30 days.

Description

Unbound 1.6.4 through 1.9.4 contain a vulnerability in the ipsec module that can cause shell code execution after receiving a specially crafted answer. This issue can only be triggered if unbound was compiled with `--enable-ipsecmod` support, and ipsecmod is enabled and used in the configuration.

Metrics

CVSS 3.1

7.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS Probability

3.21%

86.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Nlnetlabs	Unbound	>= 1.6.4, <= 1.9.4
Fedoraproject	Fedora	31
Opensuse	Leap	15.1
Opensuse	Leap	15.2

References

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00067.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00069.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/11/19/1Exploit, Mailing List, Third Party Advisory
https://github.com/NLnetLabs/unbound/blob/release-1.9.5/doc/ChangelogRelease Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MOCR6JP7MSRARTOGEHGST64G4FJGX5VK/
https://www.nlnetlabs.nl/downloads/unbound/CVE-2019-18934.txtPatch, Vendor Advisory
https://www.nlnetlabs.nl/news/2019/Nov/19/unbound-1.9.5-released/Release Notes, Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00067.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00069.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/11/19/1Exploit, Mailing List, Third Party Advisory
https://github.com/NLnetLabs/unbound/blob/release-1.9.5/doc/ChangelogRelease Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MOCR6JP7MSRARTOGEHGST64G4FJGX5VK/
https://www.nlnetlabs.nl/downloads/unbound/CVE-2019-18934.txtPatch, Vendor Advisory
https://www.nlnetlabs.nl/news/2019/Nov/19/unbound-1.9.5-released/Release Notes, Vendor Advisory

Timeline

Published: Nov 19, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18934?

How severe is CVE-2019-18934?

CVE-2019-18934 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 3.21% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18934?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-18934?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST