CVE-2023-28979

Junos OS: In a 6PE scenario upon receipt of a specific IPv6 packet an integrity check fails

MEDIUM

4.7

CVSS Score

Published: April 17, 2023 at 12:00 AM UTC

Updated: June 17, 2026 at 05:49 AM UTC

1 product affected across 1 vendorJunos

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Severity

MEDIUM4.7

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the kernel of Juniper Networks Junos OS allows an adjacent unauthenticated attacker to bypass an integrity check. In a 6PE scenario and if an additional integrity check is configured, it will fail to drop specific malformed IPv6 packets, and then these packets will be forwarded to other connected networks. This issue affects Juniper Networks Junos OS: All versions prior to 19.3R3-S7; 19.4 versions prior to 19.4R3-S9; 20.2 versions prior to 20.2R3-S7; 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 21.4R2-S1, 21.4R3; 22.1 versions prior to 22.1R2; 22.2 versions prior to 22.2R2.

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-S920.2 ≤ v < 20.2R3-S720.3 ≤ 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 < 21.4R2-S1, 21.4R322.1 ≤ v < 22.1R222.2 ≤ v < 22.2R219.3 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 r2-s7 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-s10 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 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 20.2 r3-s5 20.2 r3-s6 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 r3 22.1 22.1 r1 22.1 r1-s1 22.1 r1-s2 22.2 22.2 r1 22.2 r1-s1 22.2 r1-s2

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 20.2R3-S7, 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 21.4R2-S1, 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

Affected range stops below 22.2R2, 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://supportportal.juniper.net/JSA70604

References (1)

Vendor Advisory

Source: [email protected]

https://supportportal.juniper.net/JSA70604

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

4.7MEDIUMjuniper

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

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-754

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