CVE-2023-22395

Junos OS: In an MPLS scenario the processing of specific packets to the device causes a buffer leak and ultimately a loss of connectivity

MEDIUM

6.5

CVSS Score

Published: January 12, 2023 at 12:00 AM UTC

Updated: June 17, 2026 at 05:35 AM UTC

1 product affected across 1 vendorJunos

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

A Missing Release of Memory after Effective Lifetime vulnerability in the kernel of Juniper Networks Junos OS allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). In an MPLS scenario specific packets destined to an Integrated Routing and Bridging (irb) interface of the device will cause a buffer (mbuf) to leak. Continued receipt of these specific packets will eventually cause a loss of connectivity to and from the device, and requires a reboot to recover. These mbufs can be monitored by using the CLI command 'show system buffers': user@host> show system buffers 783/1497/2280 mbufs in use (current/cache/total) user@host> show system buffers 793/1487/2280 mbufs in use (current/cache/total) <<<<<< mbuf usage increased This issue affects Juniper Networks Junos OS: All versions prior to 19.3R3-S7; 19.4 versions prior to 19.4R3-S9; 20.1 version 20.1R1 and later versions; 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S4; 21.1 versions prior to 21.1R3-S3; 21.2 versions prior to 21.2R3-S2; 21.3 versions prior to 21.3R3-S1; 21.4 versions prior to 21.4R3; 22.1 versions prior to 22.1R2.

Affected

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

Junos · Juniper Networks

95%

v < 19.3v < 19.3R3-S719.4 ≤ v < 19.4R3-S920.1R1 ≤ v < 20.1*20.2 ≤ v < 20.2R3-S520.3 ≤ v < 20.3R3-S520.4 ≤ v < 20.4R3-S421.1 ≤ v < 21.1R3-S321.2 ≤ v < 21.2R3-S221.3 ≤ v < 21.3R3-S121.4 ≤ v < 21.4R322.1 ≤ v < 22.1R219.3 19.3 r1 19.3 r1-s1 19.3 r2 19.3 r2-s1 19.3 r2-s2 19.3 r2-s3 19.3 r2-s4 19.3 r2-s5 19.3 r2-s6 19.3 r3 19.3 r3-s1 19.3 r3-s2 19.3 r3-s3 19.3 r3-s4 19.3 r3-s5 19.3 r3-s6 19.4 19.4 r1 19.4 r1-s1 19.4 r1-s2 19.4 r1-s3 19.4 r1-s4 19.4 r2 19.4 r2-s1 19.4 r2-s2 19.4 r2-s3 19.4 r2-s4 19.4 r2-s5 19.4 r2-s6 19.4 r2-s7 19.4 r3 19.4 r3-s1 19.4 r3-s2 19.4 r3-s3 19.4 r3-s4 19.4 r3-s5 19.4 r3-s6 19.4 r3-s7 19.4 r3-s8 19.4 r3-s9 20.1 r1 20.1 r1-s1 20.1 r1-s2 20.1 r1-s3 20.1 r1-s4 20.1 r2 20.1 r2-s1 20.1 r2-s2 20.1 r3 20.1 r3-s1 20.1 r3-s2 20.1 r3-s3 20.1 r3-s4 20.1R1 20.2 20.2 r1 20.2 r1-s1 20.2 r1-s2 20.2 r1-s3 20.2 r2 20.2 r2-s1 20.2 r2-s2 20.2 r2-s3 20.2 r3 20.2 r3-s1 20.2 r3-s2 20.2 r3-s3 20.2 r3-s4 20.3 20.3 r1 20.3 r1-s1 20.3 r1-s2 20.3 r2 20.3 r2-s1 20.3 r3 20.3 r3-s1 20.3 r3-s2 20.3 r3-s3 20.3 r3-s4 20.4 20.4 r1 20.4 r1-s1 20.4 r2 20.4 r2-s1 20.4 r2-s2 20.4 r3 20.4 r3-s1 20.4 r3-s2 20.4 r3-s3 21.1 21.1 r1 21.1 r1-s1 21.1 r2 21.1 r2-s1 21.1 r2-s2 21.1 r3 21.1 r3-s1 21.1 r3-s2 21.2 21.2 r1 21.2 r1-s1 21.2 r1-s2 21.2 r2 21.2 r2-s1 21.2 r2-s2 21.2 r3 21.2 r3-s1 21.3 21.3 r1 21.3 r1-s1 21.3 r1-s2 21.3 r2 21.3 r2-s1 21.3 r2-s2 21.3 r3 21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 21.4 r2 21.4 r2-s1 22.1 22.1 r1 22.1 r1-s1

Affected range stops below 19.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.3R3-S7, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.4R3-S9, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.1*, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.2R3-S5, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.3R3-S5, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.4R3-S4, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.1R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R3-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.3R3-S1, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://kb.juniper.net/JSA70191

References (1)

Vendor Advisory

Source: [email protected]

https://kb.juniper.net/JSA70191

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMjuniper

Attack Vector: ADJACENT_NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-401

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