Junos OS and Junos OS Evolved: RPD crash when attempting to send a very long AS PATH to a non-4-byte-AS capable BGP neighbor (Juniper Networks Junos OS)

CVE-2023-44186

HIGH 7.5

At a glance

Source: NVD
EPSS: EPSS 0.64 % · percentile 51 (2026-10-31)
State: PUBLISHED
Published: 2023-10-11 20:08 UTC
Updated: 2024-12-03 14:49 UTC
Assigner: juniper
NVD status: Modified

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Description

An Improper Handling of Exceptional Conditions vulnerability in AS PATH processing of Juniper Networks Junos OS and Junos OS Evolved allows an attacker to send a BGP update message with an AS PATH containing a large number of 4-byte ASes, leading to a Denial of Service (DoS). Continued receipt and processing of these BGP updates will create a sustained Denial of Service (DoS) condition. This issue is hit when the router has Non-Stop Routing (NSR) enabled, has a non-4-byte-AS capable BGP neighbor, receives a BGP update message with a prefix that includes a long AS PATH containing large number of 4-byte ASes, and has to advertise the prefix towards the non-4-byte-AS capable BGP neighbor. Note: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability. This issue affects: Juniper Networks Junos OS: * All versions prior to 20.4R3-S8; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S6; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S4; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R2-S2, 22.3R3-S1; * 22.4 versions prior to 22.4R2-S1, 22.4R3. Juniper Networks Junos OS Evolved * All versions prior to 20.4R3-S8-EVO; * 21.1 versions 21.1R1-EVO and later; * 21.2 versions prior to 21.2R3-S6-EVO; * 21.3 versions prior to 21.3R3-S5-EVO; * 21.4 versions prior to 21.4R3-S5-EVO; * 22.1 versions prior to 22.1R3-S4-EVO; * 22.2 versions prior to 22.2R3-S2-EVO; * 22.3 versions prior to 22.3R2-S2-EVO, 22.3R3-S1-EVO; * 22.4 versions prior to 22.4R2-S1-EVO, 22.4R3-EVO.

Weaknesses (CWE)

CWE-755 — Improper Handling of Exceptional Conditions

References

https://supportportal.juniper.net/JSA73150

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	juniper
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · sirt@juniper.net (Secondary)
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2023-48545
GCVE · GCVE-0-2023-44186

CERT-FR advisories

CERTFR-2023-AVI-0836 — Multiples vulnérabilités dans les produits Juniper · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* < 20.4
cpe:2.3:o:juniper:junos:20.4:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r3-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r3-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r3-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r3-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r3-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r3-s6:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.4:r3-s7:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.1:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.1:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.1:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.1:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.1:r2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.1:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.1:r3-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.1:r3-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.1:r3-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.1:r3-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.1:r3-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r1-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.3:-:*:*:*:*:*:*
+143 more

Affected products

Product	Versions
Juniper Networks · Junos OS	affected 0 < 20.4R3-S8 ; affected 21.1R1 < 21.1* ; affected 21.2 < 21.2R3-S6 ; affected 21.3 < 21.3R3-S5 ; affected 21.4 < 21.4R3-S5 ; affected 22.1 < 22.1R3-S4
Juniper Networks · Junos OS Evolved	affected 0 < 20.4R3-S8-EVO ; affected 21.1 < 21.1*-EVO ; affected 21.2 < 21.2R3-S6-EVO ; affected 21.3 < 21.3R3-S5-EVO ; affected 21.4 < 21.4R3-S5-EVO ; affected 22.1 < 22.1R3-S4-EVO

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD

⚠️ Junos OS and Junos OS Evolved: RPD crash when attempting to send a very long AS PATH to a non-4-byte-AS capable BGP neighbor (Juniper Networks Junos OS)