CVE-2020-1625

Junos OS: Kernel memory leak in virtual-memory due to interface flaps

MEDIUM

6.5

CVSS Score

Published: April 8, 2020 at 07:25 PM UTC

Updated: June 17, 2026 at 03:02 AM UTC

1 product affected across 1 vendorJunos

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.8%

Description

The kernel memory usage represented as "temp" via 'show system virtual-memory' may constantly increase when Integrated Routing and Bridging (IRB) is configured with multiple underlay physical interfaces, and one interface flaps. This memory leak can affect running daemons (processes), leading to an extended Denial of Service (DoS) condition. Usage of "temp" virtual memory, shown here by a constantly increasing value of outstanding Requests, can be monitored by executing the 'show system virtual-memory' command as shown below: user@junos> show system virtual-memory |match "fpc|type|temp" fpc0: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2023 431K - 10551 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 fpc1: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2020 431K - 6460 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 user@junos> show system virtual-memory |match "fpc|type|temp" fpc0: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2023 431K - 16101 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 fpc1: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2020 431K - 6665 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 user@junos> show system virtual-memory |match "fpc|type|temp" fpc0: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2023 431K - 21867 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 fpc1: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2020 431K - 6858 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 This issue affects Juniper Networks Junos OS: 16.1 versions prior to 16.1R7-S6; 17.1 versions prior to 17.1R2-S11, 17.1R3-S1; 17.2 versions prior to 17.2R2-S8, 17.2R3-S3; 17.2X75 versions prior to 17.2X75-D44; 17.3 versions prior to 17.3R2-S5, 17.3R3-S6; 17.4 versions prior to 17.4R2-S5, 17.4R3; 18.1 versions prior to 18.1R3-S7; 18.2 versions prior to 18.2R2-S5, 18.2R3; 18.2X75 versions prior to 18.2X75-D33, 18.2X75-D411, 18.2X75-D420, 18.2X75-D60; 18.3 versions prior to 18.3R1-S5, 18.3R2-S3, 18.3R3; 18.4 versions prior to 18.4R2-S2, 18.4R3; 19.1 versions prior to 19.1R1-S3, 19.1R2; 19.2 versions prior to 19.2R1-S3, 19.2R2. This issue does not affect Juniper Networks Junos OS 12.3 and 15.1.

Affected

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

Junos · Juniper Networks

95%

16.1 ≤ v < 16.1R7-S617.1 ≤ v < 17.1R2-S11, 17.1R3-S117.2 ≤ v < 17.2R2-S8, 17.2R3-S317.2X75 ≤ v < 17.2X75-D4417.3 ≤ v < 17.3R2-S5, 17.3R3-S617.4 ≤ v < 17.4R2-S5, 17.4R318.1 ≤ v < 18.1R3-S718.2 ≤ v < 18.2R2-S5, 18.2R318.2X75 ≤ v < 18.2X75-D33, 18.2X75-D411, 18.2X75-D420, 18.2X75-D6018.3 ≤ v < 18.3R1-S5, 18.3R2-S3, 18.3R318.4 ≤ v < 18.4R2-S2, 18.4R319.1 ≤ v < 19.1R1-S3, 19.1R219.2 ≤ v < 19.2R1-S3, 19.2R216.1 16.1 r1 16.1 r2 16.1 r3 16.1 r3-s10 16.1 r3-s11 16.1 r4 16.1 r4-s12 16.1 r4-s2 16.1 r4-s3 16.1 r4-s4 16.1 r4-s6 16.1 r5 16.1 r5-s4 16.1 r6-s1 16.1 r6-s6 16.1 r7 16.1 r7-s2 16.1 r7-s3 16.1 r7-s4 16.1 r7-s5 17.1 17.1 r1 17.1 r2 17.1 r2-s1 17.1 r2-s10 17.1 r2-s2 17.1 r2-s3 17.1 r2-s4 17.1 r2-s5 17.1 r2-s6 17.1 r2-s7 17.1 r2-s8 17.1 r2-s9 17.1 r3 17.2 17.2 r1 17.2 r1-s1 17.2 r1-s2 17.2 r1-s3 17.2 r1-s4 17.2 r1-s5 17.2 r1-s7 17.2 r1-s8 17.2 r2 17.2 r2-s6 17.2 r2-s7 17.2 r3-s1 17.2 r3-s2 17.2X7517.2x7517.3 17.3 r1-s1 17.3 r2 17.3 r2-s1 17.3 r2-s2 17.3 r2-s3 17.3 r2-s4 17.3 r3 17.3 r3-s1 17.3 r3-s2 17.3 r3-s3 17.3 r3-s4 17.3 r3-s5 17.4 17.4 r1 17.4 r1-s1 17.4 r1-s2 17.4 r1-s4 17.4 r1-s5 17.4 r1-s6 17.4 r1-s7 17.4 r2 17.4 r2-s1 17.4 r2-s2 17.4 r2-s3 17.4 r2-s4 18.1 18.1 r2 18.1 r2-s1 18.1 r2-s2 18.1 r2-s4 18.1 r3 18.1 r3-s1 18.1 r3-s2 18.1 r3-s3 18.1 r3-s4 18.1 r3-s6 18.2 18.2 r1-s3 18.2 r1-s5 18.2 r2-s1 18.2 r2-s2 18.2 r2-s3 18.2 r2-s4 18.2X7518.2x7518.2x75 d20 18.2x75 d30 18.2x75 d40 18.3 18.3 r1 18.3 r1-s1 18.3 r1-s2 18.3 r1-s3 18.3 r1-s5 18.3 r2 18.3 r2-s1 18.3 r2-s2 18.4 18.4 r1 18.4 r1-s1 18.4 r1-s2 18.4 r1-s5 18.4 r2 18.4 r2-s1 19.1 19.1 r1 19.1 r1-s1 19.1 r1-s2 19.2 19.2 r1 19.2 r1-s1 19.2 r1-s2

Affected range stops below 16.1R7-S6, so it looks safe — our inference, not a vendor statement

Affected range stops below 17.1R2-S11, 17.1R3-S1, so it looks safe — our inference, not a vendor statement

Affected range stops below 17.2R2-S8, 17.2R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 17.2X75-D44, so it looks safe — our inference, not a vendor statement

Affected range stops below 17.3R2-S5, 17.3R3-S6, so it looks safe — our inference, not a vendor statement

Affected range stops below 17.4R2-S5, 17.4R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.1R3-S7, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.2R2-S5, 18.2R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.2X75-D33, 18.2X75-D411, 18.2X75-D420, 18.2X75-D60, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.3R1-S5, 18.3R2-S3, 18.3R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.4R2-S2, 18.4R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.1R1-S3, 19.1R2, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.2R1-S3, 19.2R2, 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://kb.juniper.net/JSA11004

References (1)

x_refsource_CONFIRMExploitVendor Advisory

Source: [email protected]

https://kb.juniper.net/JSA11004

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-400CWE-401

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