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CVE-2020-8622

A truncated TSIG response can lead to an assertion failure

MEDIUM
6.5
CVSS Score
Published: August 21, 2020 at 08:50 PM UTC
Updated: June 17, 2026 at 03:26 AM UTC
8 products affected across 8 vendorsDebian LinuxFedoraUbuntu Linux

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Severity
MEDIUM6.5
Exploit prediction
EPSS 6%

Description

In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux· Canonicalrubygems
95%
12.0414.0416.0418.0420.04
Debian Linux· Debiandrupal
95%
10.09.0
Fedora· Fedora Projectrpm
95%
3132
BIND· Isc
95%
v ≥ 9.0.0v ≥ 9.12.0v ≥ 9.17.0v < 9.11.22v < 9.16.6v < 9.17.49.0.0 ≤ v ≤ 9.11.219.12.0 ≤ v ≤ 9.16.59.17.0 ≤ v ≤ 9.17.39.9.3-S1 ≤ v < Supported Preview*9.0.09.11.21 s19.12.09.17.09.9.3 s19.9.3-S1
Affected range stops below 9.11.22, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.16.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.17.4, so it looks safe — our inference, not a vendor statement
Affected range stops below Supported Preview*, so it looks safe — our inference, not a vendor statement
Steelstore Cloud Integrated Storage· NetApp
95%
All versions
Leap· openSUSEdrupal
95%
15.115.2
Communications Diameter Signaling Router· Oracle
95%
8.0.0 ≤ v ≤ 8.5.0
DNS Server· Synology
95%
v < 2.2.2-5028
Affected range stops below 2.2.2-5028, so it looks safe — our inference, not a vendor statement

References (13)

Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://kb.isc.org/docs/cve-2020-8622
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/08/msg00053.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DQN62GBMCIC5AY4KYADGXNKVY6AJKSJE/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKAMJZXR66P6S5LEU4SN7USSNCWTXEXP/
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202008-19
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20200827-0003/

CVSS

6.5MEDIUMisc
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-617

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