Unbound < 1.4.10 daemon/worker.c DNS Request Error Handling DoS

Medium Nessus Plugin ID 55049

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VPR Score: 3.6


The remote name server is affected by a denial of service vulnerability.


According to its self-reported version number, the remote Unbound DNS resolver is affected by a denial of service vulnerability due improper error handling. An unauthenticated, remote attacker can exploit this, via a specially crafted DNS request, to cause an assertion failure and a daemon exit, resulting in a denial of service condition. Note that this vulnerability only exists when debugging functionality is enabled (e.g. --enable-checking' or '--enable-debug') and the interface-automatic option is turned on.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade to Unbound version 1.4.10 or later.

See Also



Plugin Details

Severity: Medium

ID: 55049

File Name: unbound_1_4_10.nasl

Version: 1.7

Type: remote

Family: DNS

Published: 2011/06/10

Updated: 2018/11/15

Dependencies: 87872

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Medium

VPR Score: 3.6

CVSS v2.0

Base Score: 4.3

Temporal Score: 3.2

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:unbound:unbound

Required KB Items: unbound/version, Settings/ParanoidReport

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2011/05/25

Vulnerability Publication Date: 2011/05/25

Reference Information

CVE: CVE-2011-1922

BID: 47986

CERT: 531342