CVE-2019-18934
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.20%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.3 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- EPSS
- 3.20% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- nlnetlabs/unbound · fedoraproject/fedora · opensuse/leap
- Source
- cve@mitre.org
EPSS 3.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.