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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1261 JSA11121 - 2021-04 Security Bulletin: Junos OS Evolved: The IPv6 BGP session will flap due to receipt of a specific IPv6 packet 15 April 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Junos OS Evolved: IPv6 BGP Publisher: Juniper Networks Operating System: Juniper Impact/Access: Denial of Service -- Remote/Unauthenticated Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-0226 Original Bulletin: http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11121 - --------------------------BEGIN INCLUDED TEXT-------------------- 2021-04 Security Bulletin: Junos OS Evolved: The IPv6 BGP session will flap due to receipt of a specific IPv6 packet Article ID : JSA11121 Last Updated: 14 Apr 2021 Version : 1.0 Product Affected: This issue affects Junos OS Evolved 19.4-EVO, 20.1-EVO, 20.2-EVO, 20.3-EVO. Problem: On Juniper Networks Junos OS Evolved devices, receipt of a specific IPv6 packet may cause an established IPv6 BGP session to terminate, creating a Denial of Service (DoS) condition. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue does not affect IPv4 BGP sessions. This issue affects IBGP or EBGP peer sessions with IPv6. This issue affects: Juniper Networks Junos OS Evolved: o 19.4 versions prior to 19.4R2-S3-EVO; o 20.1 versions prior to 20.1R2-S3-EVO; o 20.2 versions prior to 20.2R2-S1-EVO; o 20.3 versions prior to 20.3R2-EVO. This issue does not affect Juniper Networks Junos OS releases. Juniper SIRT is not aware of any malicious exploitation of this vulnerability. This issue was seen during production usage. This issue has been assigned CVE-2021-0226 . Solution: The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 19.4R2-S3-EVO, 20.1R2-S3-EVO, 20.2R2-S1-EVO, 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases. This issue is being tracked as 1544978 . Workaround: There are no viable workarounds for this issue. Implementation: Software releases or updates are available for download at https:// support.juniper.net/support/downloads/ Modification History: 2021-04-14: Initial Publication. CVSS Score: 7.1 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H) Severity Level: High Severity Assessment: Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories." - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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