CVE-2021-31372
Last modified
CVE-2021-31372 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An Improper Input Validation vulnerability in J-Web of Juniper Networks Junos OS allows a locally authenticated J-Web attacker to escalate their privileges to root over the target device. This issue affects: Juniper Networks Junos OS All versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2, 21.1R3; 21.2 versions prior to 21.2R1-S1, 21.2R2;. EPSS estimates a 1.19% chance of exploitation in the next 30 days.
Description
An Improper Input Validation vulnerability in J-Web of Juniper Networks Junos OS allows a locally authenticated J-Web attacker to escalate their privileges to root over the target device. This issue affects: Juniper Networks Junos OS All versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2, 21.1R3; 21.2 versions prior to 21.2R1-S1, 21.2R2;
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Juniper | Junos | <= 18.2 | — |
| Juniper | Junos | 18.3 | — |
| Juniper | Junos | 18.4 | — |
| Juniper | Junos | 19.1 | — |
| Juniper | Junos | 19.2 | — |
| Juniper | Junos | 19.3 | — |
| Juniper | Junos | 19.4 | R1 |
| Juniper | Junos | 20.1 | R1 |
| Juniper | Junos | 20.2 | R1 |
| Juniper | Junos | 20.3 | R1 |
| Juniper | Junos | 20.4 | R1 |
| Juniper | Junos | 21.1 | R1 |
| Juniper | Junos | 21.2 | R1 |
References
- https://kb.juniper.net/JSA11237Vendor Advisory
- https://kb.juniper.net/JSA11237Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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