CVE-2021-0269
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
Junos OS: J-Web can be compromised through reflected client-side HTTP parameter pollution attacks.
The improper handling of client-side parameters in J-Web of Juniper Networks Junos OS allows an attacker to perform a number of different malicious actions against a target device when a user is authenticated to J-Web. An attacker may be able to supersede existing parameters, including hardcoded parameters within the HTTP/S session, access and exploit variables, bypass web application firewall rules or input validation mechanisms, and otherwise alter and modify J-Web's normal behavior. An attacker may be able to transition victims to malicious web services, or exfiltrate sensitive information from otherwise secure web forms. This issue affects: Juniper Networks Junos OS: All versions prior to 17.4R3-S3; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S2, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Junos OS
- Vendor
- Juniper Networks
- Product
- Junos OS
- Platforms
- Unknown
- Default status
Unknown
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| unspecified | affected | custom | 17.4R3-S3 | Unavailable | None listed |
| 18.1 | affected | custom | 18.1R3-S12 | Unavailable | None listed |
| 18.2 | affected | custom | 18.2R3-S6 | Unavailable | None listed |
| 18.3 | affected | custom | 18.3R3-S4 | Unavailable | None listed |
| 18.4 | affected | custom | 18.4R3-S6 | Unavailable | None listed |
| 19.1 | affected | custom | 19.1R3-S4 | Unavailable | None listed |
| 19.2 | affected | custom | 19.2R3-S1 | Unavailable | None listed |
| 19.3 | affected | custom | 19.3R3-S1 | Unavailable | None listed |
| 19.4 | affected | custom | 19.4R2-S2, 19.4R3 | Unavailable | None listed |
| 20.1 | affected | custom | 20.1R2 | Unavailable | None listed |
| 20.2 | affected | custom | 20.2R2 | Unavailable | None listed |