CVE-2019-6477

MEDIUM

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).

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html

https://kb.isc.org/docs/cve-2019-6477

https://lists.fedoraproject.org/archives/list/[email protected]/message/L3DEMNZMKR57VQJCG5ZN55ZGTQRL2TFQ/

https://lists.fedoraproject.org/archives/list/[email protected]/message/XGURMGQHX45KR4QDRCSUQHODUFOGNGAN/

https://support.f5.com/csp/article/K15840535?utm_source=f5support&utm_medium=RSS

https://www.debian.org/security/2020/dsa-4689

https://www.synology.com/security/advisory/Synology_SA_19_39

Details

Source: MITRE

Published: 2019-11-26

Updated: 2020-10-20

Type: CWE-400

Risk Information

CVSS v2.0

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3.0

Base Score: 7.5

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

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH