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AUSCERT External Security Bulletin Redistribution
JSA11116 - 2021-04 Security Bulletin: Junos OS: SRX Series: An assertion
failure in BIND can be used to trigger a Denial of Service (DoS)
15 April 2021
AusCERT Security Bulletin Summary
Product: Junos OS: SRX Series
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Existing Account
CVE Names: CVE-2020-8622
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2021-04 Security Bulletin: Junos OS: SRX Series: An assertion failure in BIND
can be used to trigger a Denial of Service (DoS) (CVE-2020-8622)
Article ID : JSA11116
Last Updated: 14 Apr 2021
Version : 2.0
This issue affects Junos OS 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2,
19.3, 19.4, 20.1, 20.2.
A vulnerability in BIND, used in Juniper Networks Junos OS on SRX Series
devices, may allow an attacker on the network path for a transaction
signature-signed request (TSIG-signed request), to trigger an assertion
failure, resulting in a Denial of Service (DoS).
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 cause a Denial of Service (DoS)
This issue only affect SRX Series devices, which is the only platform that
ships with BIND software. No other products or platforms are affected by this
This issue affects Juniper Networks Junos OS on SRX Series:
o 17.3 versions prior to 17.3R3-S11;
o 17.4 versions prior to 17.4R2-S12, 17.4R3-S3;
o 18.1 versions prior to 18.1R3-S11;
o 18.2 versions prior to 18.2R2-S8, 18.2R3-S7;
o 18.3 versions prior to 18.3R3-S4;
o 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S6;
o 19.1 versions prior to 19.1R1-S6, 19.1R3-S4;
o 19.2 versions prior to 19.2R1-S6, 19.2R3-S1;
o 19.3 versions prior to 19.3R2-S5, 19.3R3-S1;
o 19.4 versions prior to 19.4R2-S2, 19.4R3;
o 20.1 versions prior to 20.1R2;
o 20.2 versions prior to 20.2R1-S3, 20.2R2, 20.2R3.
The following minimal configuration is required:
[system services dns dns-proxy cache "dns name" inet "ip address"]
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was discovered during a external security research.
This issue has been assigned CVE-2020-8622 .
The following software releases have been updated to resolve this specific
issue: 17.3R3-S11, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R2-S8, 18.2R3-S7,
18.3R3-S4, 18.4R1-S8, 18.4R2-S7, 18.4R3-S6, 19.1R1-S6, 19.1R3-S4, 19.2R1-S6,
19.2R3-S1, 19.3R2-S5, 19.3R3-S1, 19.4R2-S2, 19.4R3, 20.1R2, 20.2R1-S3, 20.2R2,
20.2R3, 20.3R1, and all subsequent releases.
There are no viable workarounds for this issue.
Software releases or updates are available for download at https://
2021-04-14: Initial Publication.
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."
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