Detections
Analytics
Alpine: multiple unbound packages, py-unbound: security update to 1.20.0-r1
medium Tenable Cloud Security Plugin ID 425641
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with
very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very
large RRsets can cause Unbound to spend a considerable time applying name compression to downstream
replies. This can lead to degraded performance and eventually denial of service in well orchestrated
attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially
crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will
try to apply name compression which was an unbounded operation that could lock the CPU until the whole
packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression
calculations it is willing to do per packet. Packets that need more compression will result in semi-
compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long.
This change should not affect normal DNS traffic. (CVE-2024-8508)
See Also
Plugin Details
Severity: Medium
ID: 425641
Version: Revision 1.4
Type: Local
Published: 4/15/2025
Updated: 7/2/2026
Supported Sensors: Agentless Assessment, 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-2024-8508
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
Vulnerability Publication Date: 10/3/2024
Reference Information
CVE: CVE-2024-8508
IAVA: 2024-A-0682