CVE-2023-22396

Junos OS: Receipt of crafted TCP packets destined to the device results in MBUF leak leading to a Denial of Service (DoS)

HIGH

7.5

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

HIGH7.5

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

Description

An Uncontrolled Resource Consumption vulnerability in TCP processing on the Routing Engine (RE) of Juniper Networks Junos OS allows an unauthenticated network-based attacker to send crafted TCP packets destined to the device, resulting in an MBUF leak that ultimately leads to a Denial of Service (DoS). The system does not recover automatically and must be manually restarted to restore service. This issue occurs when crafted TCP packets are sent directly to a configured IPv4 or IPv6 interface on the device. Transit traffic will not trigger this issue. MBUF usage can be monitored through the use of the 'show system buffers' command. For example: user@junos> show system buffers | refresh 5 4054/566/4620 mbufs in use (current/cache/total) ... 4089/531/4620 mbufs in use (current/cache/total) ... 4151/589/4740 mbufs in use (current/cache/total) ... 4213/527/4740 mbufs in use (current/cache/total) This issue affects Juniper Networks Junos OS: 12.3 version 12.3R12-S19 and later versions; 15.1 version 15.1R7-S10 and later versions; 17.3 version 17.3R3-S12 and later versions; 18.4 version 18.4R3-S9 and later versions; 19.1 version 19.1R3-S7 and later versions; 19.2 version 19.2R3-S3 and later versions; 19.3 version 19.3R2-S7, 19.3R3-S3 and later versions prior to 19.3R3-S7; 19.4 version 19.4R2-S7, 19.4R3-S5 and later versions prior to 19.4R3-S10; 20.1 version 20.1R3-S1 and later versions; 20.2 version 20.2R3-S2 and later versions prior to 20.2R3-S6; 20.3 version 20.3R3-S1 and later versions prior to 20.3R3-S6; 20.4 version 20.4R2-S2, 20.4R3 and later versions prior to 20.4R3-S5; 21.1 version 21.1R2 and later versions prior to 21.1R3-S4; 21.2 version 21.2R1-S1, 21.2R2 and later versions prior to 21.2R3-S3; 21.3 versions prior to 21.3R3-S2; 21.4 versions prior to 21.4R3; 22.1 versions prior to 22.1R2-S1, 22.1R3; 22.2 versions prior to 22.2R1-S2, 22.2R2; 22.3 versions prior to 22.3R1-S1, 22.3R2.

Affected

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

Junos · Juniper Networks

95%

12.3R12-S19 ≤ v < 12.3*15.1R7-S10 ≤ v < 15.1*17.3R3-S12 ≤ v < 17.3*18.4R3-S9 ≤ v < 18.4*19.1R3-S7 ≤ v < 19.1*19.2R3-S3 ≤ v < 19.2*19.3R2-S7, 19.3R3-S3 ≤ v < 19.3*19.4R2-S7, 19.4R3-S5 ≤ v < 19.4*20.1R3-S1 ≤ v < 20.1*20.2R3-S2 ≤ v < 20.2*20.3R3-S1 ≤ v < 20.3*20.4R2-S2, 20.4R3 ≤ v < 20.4*21.1R2 ≤ v < 21.1*21.2R1-S1, 21.2R2 ≤ v < 21.2*21.3 ≤ v < 21.3R3-S221.4 ≤ v < 21.4R322.1 ≤ v < 22.1R2-S1, 22.1R322.2 ≤ v < 22.2R1-S2, 22.2R222.3 ≤ v < 22.3R1-S1, 22.3R212.3 r12-s19 12.3 r12-s20 12.3R12-S19 15.1 r7-s10 15.1 r7-s11 15.1 r7-s12 15.1R7-S10 17.3 r3-s12 17.3R3-S12 18.4 r3-s10 18.4 r3-s11 18.4 r3-s9 18.4R3-S9 19.1 r3-s7 19.1 r3-s8 19.1R3-S7 19.2 r3-s3 19.2 r3-s4 19.2 r3-s5 19.2R3-S3 19.3 r2-s7 19.3 r3-s3 19.3 r3-s4 19.3 r3-s5 19.3 r3-s6 19.3R2-S7 19.3R3-S3 19.4 19.4 r2-s7 19.4 r3-s5 19.4 r3-s6 19.4 r3-s7 19.4 r3-s8 19.4 r3-s9 19.4R2-S7 19.4R3-S5 20.1 r3-s1 20.1 r3-s2 20.1 r3-s3 20.1 r3-s4 20.1R3-S1 20.2 r3-s2 20.2 r3-s3 20.2 r3-s4 20.2 r3-s5 20.2R3-S2 20.3 r3-s1 20.3 r3-s2 20.3 r3-s3 20.3 r3-s4 20.3 r3-s5 20.3R3-S1 20.4 r2-s2 20.4 r3 20.4 r3-s1 20.4 r3-s2 20.4 r3-s3 20.4 r3-s4 20.4 r3-s5 20.4R2-S2 20.4R3 21.1 r2 21.1 r2-s1 21.1 r2-s2 21.1 r3 21.1 r3-s1 21.1 r3-s2 21.1 r3-s3 21.1R2 21.2 r1-s1 21.2 r2 21.2 r2-s1 21.2 r2-s2 21.2 r3 21.2 r3-s1 21.2 r3-s2 21.2R1-S1 21.2R2 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 21.3 r3-s1 21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 21.4 r2 21.4 r2-s1 21.4 r2-s2 22.1 22.1 r1 22.1 r1-s1 22.1 r1-s2 22.1 r2 22.1 r3 22.2 22.2 r1 22.2 r1-s1 22.2 r2 22.3 22.3 r1 22.3 r2

Affected range stops below 12.3*, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.1*, so it looks safe — our inference, not a vendor statement

Affected range stops below 17.3*, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.4*, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.1*, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.2*, so it looks safe — our inference, not a vendor statement

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

Affected range stops below 19.4*, 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 20.2*, so it looks safe — our inference, not a vendor statement

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

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

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

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

Affected range stops below 21.3R3-S2, 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-S1, 22.1R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R1-S2, 22.2R2, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R1-S1, 22.3R2, 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/JSA70192

References (1)

Vendor Advisory

Source: [email protected]

https://kb.juniper.net/JSA70192

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

7.5HIGHjuniper

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

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-400

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