No exploitation reported

CVE-2019-6477

No exploitation reported by the sources we read.

Published2019-11-26
WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

With pipelining enabled each incoming query on a TCP connection requires a similar resource allocation to a query received via UDP or via TCP without pipelining enabled. A client using a TCP-pipelined connection to a server could consume more resources than the server has been provisioned to handle. When a TCP connection with a large number of pipelined queries is closed, the load on the server releasing these multiple resources can cause it to become unresponsive, even for queries that can be answered authoritatively or from cache. (This is most likely to be perceived as an intermittent server problem).

Timeline

dates in UTC

2019-11-2616:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-6477?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-6477?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Isc bind

Branch	Affected	Fixed in	Source
9.11	≥ 9.11.7, ≤ 9.11.12	no fix published	NVD
9.14	≥ 9.14.1, ≤ 9.14.7	no fix published	NVD
9.15	≥ 9.15.0, ≤ 9.15.5	no fix published	NVD
9.11	= 9.11.5	no fix published	NVD
9.11	= 9.11.6	no fix published	NVD
9.11	= 9.11.12	no fix published	NVD
9.12	= 9.12.4	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
30.x	= 30	no fix published	NVD
31.x	= 31	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.17.5read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-400read 2026-10-23
FIRST EPSSEPSS score4.1 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2019-11-26
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-6477?

Is CVE-2019-6477 actively exploited?

Active exploitation of CVE-2019-6477 has not been confirmed. Its EPSS score was 4.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-6477?

CVE-2019-6477 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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