Detections
Analytics

Echo: bind9: security update to 1:9.20.23-1~deb13u1

medium Tenable Cloud Security Plugin ID 464023

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server
 handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending
 queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through
 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1
 through 9.20.22-S1. (CVE-2026-5950)

Solution

Update the bind9 library and its related packages to version 1:9.20.23-1~deb13u1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-5950

Plugin Details

Severity: Medium

ID: 464023

Version: Revision 1.2

Type: Local

Published: 10/2/2026

Updated: 10/5/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-5950

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/21/2026

Vulnerability Publication Date: 5/20/2026

Reference Information

CVE: CVE-2026-5950

IAVA: 2026-A-0498-S