01 Record

CVE-2023-4481

Junos OS and Junos OS Evolved: A crafted BGP UPDATE message allows a remote attacker to de-peer (reset) BGP sessions (CVE-2023-4481)

HighPUBLISHEDCNA: juniper

CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

View raw JSON

02 Description

Junos OS and Junos OS Evolved: A crafted BGP UPDATE message allows a remote attacker to de-peer (reset) BGP sessions (CVE-2023-4481)

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

18.21% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 97.0% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2023-08-31 23:46Z3 YR AGO

Last updated

2024-10-02 15:09Z1 YR AGO

Reserved

2023-08-22

Assigning CNA

juniper

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

d5985587451197fdcc805edcd21c9206d15703a520e986cebebb8bd16ca5e72a

05 Affected products

VendorProductVersionsPlatforms

Juniper Networks, Inc.Junos OS0 to < 20.4R3-S10, 21.2 to < 21.2R3-S5, 21.3 to < 21.3R3-S5, 21.4 to < 21.4R3-S7, 22.1 to < 22.1R3-S4, 22.2 to < 22.2R3-S3, 22.3 to < 22.3R3-S1, 22.4 to < 22.4R3, 23.2 to < 23.2R2, 21.1R1 to 21.*—

Juniper Networks, Inc.Junos OS Evolved0 to < 20.4R3-S10-EVO, 21.2-EVO to < 21.2R3-S7-EVO, 21.3-EVO to < 21.3R3-S5-EVO, 21.4-EVO to < 21.4R3-S5-EVO, 22.1-EVO to < 22.1R3-S4-EVO, 22.2-EVO to < 22.2R3-S3-EVO, 22.3-EVO to < 22.3R3-S1-EVO, 22.4-EVO to < 22.4R3-EVO, 23.2-EVO to < 23.2R2-EVO—

juniper_networksjunos_os0 to < 20.4R3-S10, 21.2 to < 21.2R3-S5, 21.3 to < 21.3R3-S5, 21.4 to < 21.4R3-S7, 22.1 to < 22.1R3-S4, 22.2 to < 22.2R3-S3, 22.3 to < 22.3R3-S1, 22.4 to < 22.4R3, 23.2 to < 23.2R2, 21.1R1 to < 21.*—

juniper_networksjunos_os_evolved0 to < 20.4R3-S10-EVO, 21.2-EVO to < 21.2R3-S7-EVO, 21.3-EVO to < 21.3R3-S5-EVO, 21.4-EVO to < 21.4R3-S5-EVO, 22.1-EVO to < 22.1R3-S4-EVO, 22.2-EVO to < 22.2R3-S3-EVO, 22.3-EVO to < 22.3R3-S1-EVO, 22.4-EVO to < 22.4R3-EVO, 23.2-EVO to < 23.2R2-EVO—

06 References

kb.juniper.nethttps://kb.juniper.net/JSA72510vendor-advisory
www.rfc-editor.orghttps://www.rfc-editor.org/rfc/rfc7606technical-description
www.rfc-editor.orghttps://www.rfc-editor.org/rfc/rfc4271technical-description
www.juniper.nethttps://www.juniper.net/documentation/us/en/software/junos/bgp/topics/topic-map/bgp-error-messages.htmltechnical-description

07 Remediation

The following software releases have been updated to resolve this specific issue: Junos OS: 20.4R3-S10, 21.2R3-S7, 21.3R3-S5, 21.4R3-S5 or 21.4R3-S7, 22.1R3-S4, 22.2R3-S3, 22.3R3-S1, 22.4R3, 23.2R2, 23.3R2, 23.4R1, and all subsequent releases Note: except for Junos OS 21.4R3-S6 which is affected and unfixed. Junos OS Evolved: 20.4R3-S10-EVO, 21.2R3-S7-EVO, 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S3-EVO, 22.3R3-S1-EVO, 22.4R3-EVO, 23.2R2-EVO, 23.4R1-EVO, and all subsequent releases. It is important that customers implement the workaround in addition to taking any updated software as these crafted UPDATE messages may be propagated to other devices even if non-impacted locally, thereby protecting the network by stopping the propagation of these crafted UPDATE messages. The workaround is to configure BGP error tolerance by way of: [ protocols bgp bgp-error-tolerance ... ] Additional details can be found at https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/topic-map/bgp-error-messages.h... https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/topic-map/bgp-error-messages.html Juniper considers configuring this option to be a Best Common Practice (BCP) as it not only prevents this issue from happening, but protects against similar issues as well. This issue is being tracked as PR 1709837 https://prsearch.juniper.net/problemreport/PR1709837 which is visible on the Customer Support website. Note: Juniper SIRT's policy

01 Record index

CVE-2023-4481

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

07 Remediation

02 Records

CVE-2023-4481

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

07 Remediation