CVE-2021-25218

A too-strict assertion check could be triggered when responses in BIND 9.16.19 and 9.17.16 require UDP fragmentation if RRL is in use

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In BIND 9.16.19, 9.17.16. Also, version 9.16.19-S1 of BIND Supported Preview Edition When a vulnerable version of named receives a query under the circumstances described above, the named process will terminate due to a failed assertion check. The vulnerability affects only BIND 9 releases 9.16.19, 9.17.16, and release 9.16.19-S1 of the BIND Supported Preview Edition.

En BIND versiones 9.16.19, 9.17.16. Además, la versión 9.16.19-S1 de BIND Supported Preview Edition. Cuando una versión vulnerable de named recibe una consulta en las circunstancias descritas anteriormente, el proceso named terminará debido a una comprobación de aserción fallida. La vulnerabilidad sólo afecta a versiones 9.16.19, 9.17.16 y 9.16.19-S1 de BIND Supported Preview Edition.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-15 CVE Reserved
2021-08-18 CVE Published
2024-05-03 EPSS Updated
2024-09-17 CVE Updated
2024-09-17 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-617: Reachable Assertion

CAPEC

References (5)

URL	Tag	Source
https://security.netapp.com/advisory/ntap-20210909-0002	Third Party Advisory

URL	Date	SRC
https://kb.isc.org/v1/docs/cve-2021-25218	2024-09-17

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2021/08/18/3	2023-11-07
http://www.openwall.com/lists/oss-security/2021/08/20/2	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPJCLGSR4BTGFLBLGIE5TEQP2SNJKGVL	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Isc Search vendor "Isc"		Bind Search vendor "Isc" for product "Bind"				9.16.19 Search vendor "Isc" for product "Bind" and version "9.16.19"		-		Affected
Isc Search vendor "Isc"		Bind Search vendor "Isc" for product "Bind"				9.17.16 Search vendor "Isc" for product "Bind" and version "9.17.16"		-		Affected
Isc Search vendor "Isc"		Bind Search vendor "Isc" for product "Bind"				9.17.16 Search vendor "Isc" for product "Bind" and version "9.17.16"		s1, supported_preview		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected