CVE-2021-31371
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: QFX5000 Series: Traffic from the network internal to the device (128.0.0.0) may be forwarded to egress interfaces.
Juniper Networks Junos OS uses the 128.0.0.0/2 subnet for internal communications between the RE and PFEs. It was discovered that packets utilizing these IP addresses may egress an QFX5000 Series switch, leaking configuration information such as heartbeats, kernel versions, etc. out to the Internet, leading to an information exposure vulnerability. This issue affects Juniper Networks Junos OS on QFX5110, QFX5120, QFX5200, QFX5210 Series, and QFX5100 with QFX 5e Series image installed: All versions prior to 17.3R3-S12; 18.1 versions prior to 18.1R3-S13; 18.3 versions prior to 18.3R3-S5; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R1-S4, 19.4R3-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2;
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
- QFX5000 Series
- Default status
Unknown
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| unspecified | affected | custom | 17.3R3-S12 | Unavailable | None listed |
| 18.1 | affected | custom | 18.1R3-S13 | Unavailable | None listed |
| 18.3 | affected | custom | 18.3R3-S5 | Unavailable | None listed |
| 19.1 | affected | custom | 19.1R3-S6 | Unavailable | None listed |
| 19.2 | affected | custom | 19.2R1-S7, 19.2R3-S3 | Unavailable | None listed |
| 19.3 | affected | custom | 19.3R2-S6, 19.3R3-S3 | Unavailable | None listed |
| 19.4 | affected | custom | 19.4R1-S4, 19.4R3-S5 | Unavailable | None listed |
| 20.1 | affected | custom | 20.1R2-S2, 20.1R3-S1 | Unavailable | None listed |
| 20.2 | affected | custom | 20.2R3-S2 | Unavailable | None listed |
| 20.3 | affected | custom | 20.3R3-S1 | Unavailable | None listed |
| 20.4 | affected | custom | 20.4R2-S1, 20.4R3 | Unavailable | None listed |
| 21.1 | affected | custom | 21.1R1-S1, 21.1R2 | Unavailable | None listed |
| 21.2 | affected | custom | 21.2R1 | Unavailable | None listed |