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CVE-2018-0021

Junos OS: Short MacSec keys may allow man-in-the-middle attacks.

HIGH
8.8
CVSS Score
Published: April 11, 2018 at 07:00 PM UTC
Updated: June 17, 2026 at 01:29 AM UTC
1 product affected across 1 vendorJunos

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Severity
HIGH8.8
Exploit prediction
EPSS 0.6%

Description

If all 64 digits of the connectivity association name (CKN) key or all 32 digits of the connectivity association key (CAK) key are not configured, all remaining digits will be auto-configured to 0. Hence, Juniper devices configured with short MacSec keys are at risk to an increased likelihood that an attacker will discover the secret passphrases configured for these keys through dictionary-based and brute-force-based attacks using spoofed packets. Affected releases are Juniper Networks Junos OS: 14.1 versions prior to 14.1R10, 14.1R9; 14.1X53 versions prior to 14.1X53-D47; 15.1 versions prior to 15.1R4-S9, 15.1R6-S6, 15.1R7; 15.1X49 versions prior to 15.1X49-D100; 15.1X53 versions prior to 15.1X53-D59; 16.1 versions prior to 16.1R3-S8, 16.1R4-S8, 16.1R5; 16.2 versions prior to 16.2R1-S6, 16.2R2; 17.1 versions prior to 17.1R2.

Affected

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

Junos· Juniper Networks
95%
14.1 ≤ v < 14.1R10, 14.1R914.1X53 ≤ v < 14.1X53-D4715.1 ≤ v < 15.1R4-S9, 15.1R6-S6, 15.1R715.1X49 ≤ v < 15.1X49-D10015.1X53 ≤ v < 15.1X53-D5916.1 ≤ v < 16.1R3-S8, 16.1R4-S8, 16.1R516.2 ≤ v < 16.2R1-S6, 16.2R217.1 ≤ v < 17.1R214.114.1 r114.1 r214.1 r314.1 r414.1 r514.1 r614.1 r714.1 r914.1X5314.1x5314.1x53 d1014.1x53 d1514.1x53 d1614.1x53 d2514.1x53 d2614.1x53 d2714.1x53 d3014.1x53 d3514.1x53 d4014.1x53 d4515.115.1 r115.1 r215.1 r315.1 r415.1 r615.1X4915.1X5315.1x4915.1x49 d1015.1x49 d2015.1x49 d3015.1x49 d3515.1x49 d4015.1x49 d4515.1x49 d5015.1x49 d5515.1x49 d6015.1x49 d6515.1x49 d7015.1x49 d7515.1x49 d8015.1x49 d9015.1x5315.1x53 d1015.1x53 d2015.1x53 d2115.1x53 d3015.1x53 d3215.1x53 d3315.1x53 d3415.1x53 d5015.1x53 d5115.1x53 d5215.1x53 d5515.1x53 d5715.1x53 d5816.116.1 r116.1 r216.1 r316.1 r416.216.2 r117.117.1 r1
Affected range stops below 14.1R10, 14.1R9, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.1X53-D47, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.1R4-S9, 15.1R6-S6, 15.1R7, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.1X49-D100, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.1X53-D59, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.1R3-S8, 16.1R4-S8, 16.1R5, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.2R1-S6, 16.2R2, so it looks safe — our inference, not a vendor statement
Affected range stops below 17.1R2, 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

References (2)

VDB Entryx_refsource_SECTRACKThird Party Advisory
Source: [email protected]
http://www.securitytracker.com/id/1040789
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://kb.juniper.net/JSA10854

CVSS

8.8HIGHjuniper
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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