CVE-2019-16866

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

3.50% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 88.6% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-08.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2019-10-03 18:53Z7 YR AGO

Last updated

2026-10-08 21:03Z20 DAYS AGO

Reserved

2019-09-25

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-755Improper Handling of Exceptional ConditionsClass
• CWE-908Use of Uninitialized ResourceBase
• CWE-822Untrusted Pointer DereferenceBase

Data version

5.2

Document digest

ab077d54763f9719df346d41774c977170584f145e14be2b869451a75603c070

• github.comhttps://github.com/NLnetLabs/unbound/blob/release-1.9.4/doc/Changelogx_refsource_MISC
• nlnetlabs.nlhttps://nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txtx_refsource_MISC
• usn.ubuntu.comUSN-4149-1https://usn.ubuntu.com/4149-1/vendor-advisoryx_refsource_UBUNTU
• www.debian.orgDSA-4544https://www.debian.org/security/2019/dsa-4544vendor-advisoryx_refsource_DEBIAN
• seclists.org20191016 [SECURITY] [DSA 4544-1] unbound security updatehttps://seclists.org/bugtraq/2019/Oct/23mailing-listx_refsource_BUGTRAQ
• lists.fedoraproject.orgFEDORA-2019-e99b716a92https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E65NCWZZB2D75ZIYWPXKMVGSGNYW4JMC/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2019-0418c12a36https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MLRHE7TQFAOV4MB2ELTOGESZYUL65NUJ/vendor-advisoryx_refsource_FEDORA