Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2021-25215

Reachable Assertion

Published: Apr 29, 2021 | Modified: Nov 21, 2024
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
Vulnerability-free packages from our partners
root.io logo minimus.io logo echo.ai logo
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2021-25215
CWEhttps://cwe.mitre.org/data/definitions/617.html

In BIND 9.0.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a query for a record triggering the flaw described above, the named process will terminate due to a failed assertion check. The vulnerability affects all currently maintained BIND 9 branches (9.11, 9.11-S, 9.16, 9.16-S, 9.17) as well as all other versions of BIND 9.

Weakness

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Affected Software

NameVendorStart VersionEnd Version
Debian_linuxDebian9.0 (including)9.0 (including)
Debian_linuxDebian10.0 (including)10.0 (including)
Red Hat Enterprise Linux 6 Extended Lifecycle SupportRedHatbind-32:9.8.2-0.68.rc1.el6_10.11*
Red Hat Enterprise Linux 7RedHatbind-32:9.11.4-26.P2.el7_9.5*
Red Hat Enterprise Linux 7.2 Advanced Update SupportRedHatbind-32:9.9.4-29.el7_2.11*
Red Hat Enterprise Linux 7.3 Advanced Update SupportRedHatbind-32:9.9.4-50.el7_3.6*
Red Hat Enterprise Linux 7.4 Advanced Update SupportRedHatbind-32:9.9.4-51.el7_4.6*
Red Hat Enterprise Linux 7.4 Telco Extended Update SupportRedHatbind-32:9.9.4-51.el7_4.6*
Red Hat Enterprise Linux 7.4 Update Services for SAP SolutionsRedHatbind-32:9.9.4-51.el7_4.6*
Red Hat Enterprise Linux 7.6 Extended Update SupportRedHatbind-32:9.9.4-74.el7_6.7*
Red Hat Enterprise Linux 7.7 Extended Update SupportRedHatbind-32:9.11.4-9.P2.el7_7.5*
Red Hat Enterprise Linux 8RedHatbind-32:9.11.26-4.el8_4*
Red Hat Enterprise Linux 8RedHatbind-32:9.11.26-4.el8_4*
Red Hat Enterprise Linux 8.1 Extended Update SupportRedHatbind-32:9.11.4-26.P2.el8_1.5*
Red Hat Enterprise Linux 8.2 Extended Update SupportRedHatbind-32:9.11.13-6.el8_2.3*
Bind9Ubuntubionic*
Bind9Ubuntudevel*
Bind9Ubuntuesm-infra-legacy/trusty*
Bind9Ubuntuesm-infra/bionic*
Bind9Ubuntuesm-infra/focal*
Bind9Ubuntuesm-infra/xenial*
Bind9Ubuntufocal*
Bind9Ubuntugroovy*
Bind9Ubuntuhirsute*
Bind9Ubuntuimpish*
Bind9Ubuntujammy*
Bind9Ubuntukinetic*
Bind9Ubuntulunar*
Bind9Ubuntumantic*
Bind9Ubuntunoble*
Bind9Ubuntuoracular*
Bind9Ubuntuplucky*
Bind9Ubuntuprecise/esm*
Bind9Ubuntutrusty*
Bind9Ubuntutrusty/esm*
Bind9Ubuntuupstream*
Bind9Ubuntuxenial*

Extended Description

While assertion is good for catching logic errors and reducing the chances of reaching more serious vulnerability conditions, it can still lead to a denial of service. For example, if a server handles multiple simultaneous connections, and an assert() occurs in one single connection that causes all other connections to be dropped, this is a reachable assertion that leads to a denial of service.

Potential Mitigations

References

Aqua Security is the largest pure-play cloud native security company, providing customers the freedom to innovate and run their businesses with minimal friction. The Aqua Cloud Native Security Platform provides prevention, detection, and response automation across the entire application lifecycle to secure the build, secure cloud infrastructure and secure running workloads wherever they are deployed.
Copyright © 2026 Aqua Security Software Ltd.   Privacy Policy | Terms of Use