CVE-2021-31386

Junos OS: When using J-Web with HTTP an attacker may retrieve encryption keys via Person-in-the-Middle attacks.

State: Published
Severity: 5.3 Medium
Published: Oct 19, 2021
Updated: Sep 17, 2024
Reserved: Apr 15, 2021

Description

A Protection Mechanism Failure vulnerability in the J-Web HTTP service of Juniper Networks Junos OS allows a remote unauthenticated attacker to perform Person-in-the-Middle (PitM) attacks against the device. This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S20; 15.1 versions prior to 15.1R7-S11; 18.3 versions prior to 18.3R3-S6; 18.4 versions prior to 18.4R3-S10; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R3-S4; 19.3 versions prior to 19.3R3-S4; 19.4 versions prior to 19.4R3-S6; 20.1 versions prior to 20.1R3-S2; 20.2 versions prior to 20.2R3-S3; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R2.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N	juniper

Weaknesses

CWE-311 Missing Encryption of Sensitive Data
CWE-325 Missing Cryptographic Step
CWE-693 Protection Mechanism Failure
CWE-300 Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Affected Products

Product	Versions
Junos OSJuniper Networks	12.3 to before 12.3R12-S20Affected 15.1 to before 15.1R7-S11Affected 18.3 to before 18.3R3-S6Affected 18.4 to before 18.4R3-S10Affected 19.1 to before 19.1R3-S7Affected 19.2 to before 19.2R3-S4Affected 19.3 to before 19.3R3-S4Affected 19.4 to before 19.4R3-S6Affected 20.1 to before 20.1R3-S2Affected 20.2 to before 20.2R3-S3Affected 20.3 to before 20.3R3-S1Affected 20.4 to before 20.4R3Affected 21.1 to before 21.1R3Affected 21.2 to before 21.2R2Affected

Product

Versions

Junos OSJuniper Networks

12.3 to before 12.3R12-S20Affected
15.1 to before 15.1R7-S11Affected
18.3 to before 18.3R3-S6Affected
18.4 to before 18.4R3-S10Affected
19.1 to before 19.1R3-S7Affected
19.2 to before 19.2R3-S4Affected
19.3 to before 19.3R3-S4Affected
19.4 to before 19.4R3-S6Affected
20.1 to before 20.1R3-S2Affected
20.2 to before 20.2R3-S3Affected
20.3 to before 20.3R3-S1Affected
20.4 to before 20.4R3Affected
21.1 to before 21.1R3Affected
21.2 to before 21.2R2Affected

References

https://kb.juniper.net/JSA11254

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