Insufficient Control of Network Message Volume in Unbound by NLnet Labs
CVE-2020-12662

7.5HIGH

Key Information:

Vendor

Nlnetlabs

Status
Unbound
Vendor
CVE Published:
19 May 2020

What is CVE-2020-12662?

A vulnerability exists in Unbound prior to version 1.10.1 that allows attackers to exploit insufficient control over network message volume. This can lead to NXNSAttack scenarios wherein random subdomains in the NSDNAME field of NS records trigger excessive DNS requests, potentially overwhelming the targeted DNS server and leading to denial of service. Organizations using affected versions should upgrade to mitigate this issue.

References

https://nlnetlabs.nl/downloads/unbound/CVE-2020-12662_202...
x_refsource_CONFIRM
http://www.nxnsattack.com
x_refsource_MISC
http://www.openwall.com/lists/oss-security/2020/05/19/5
mailing-listx_refsource_MLIST

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.