CVE-2021-31360
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 and Junos OS Evolved: Denial of Service vulnerability in local file processing
An improper privilege management vulnerability in the Juniper Networks Junos OS and Junos OS Evolved command-line interpreter (CLI) allows a low-privileged user to overwrite local files as root, possibly leading to a system integrity issue or Denial of Service (DoS). Depending on the files overwritten, exploitation of this vulnerability could lead to a sustained Denial of Service (DoS) condition, requiring manual user intervention to recover. Systems are only vulnerable if jdhcpd is running, which can be confirmed via the 'show system processes' command. For example: root@host# run show system processes extensive | match dhcp 26537 root -16 0 97568K 13692K RUN 0 0:01 3.71% jdhcpd This issue affects: Juniper Networks Junos OS: All versions, including the following supported releases: 15.1 versions prior to 15.1R7-S10; 17.4 versions prior to 17.4R3-S5; 18.3 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 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R3-S6; 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; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2. Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO; All versions of 21.1-EVO.
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) |
|---|---|---|---|---|---|
| 15.1 | affected | custom | 15.1R7-S10 | Unavailable | None listed |
| 17.4 | affected | custom | 17.4R3-S5 | Unavailable | None listed |
| 18.3 | affected | custom | 18.3R3-S5 | Unavailable | None listed |
| 18.4 | affected | custom | 18.4R3-S9 | 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 | 19.4R3-S6 | 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 | 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 |
Junos OS Evolved
- Vendor
- Juniper Networks
- Product
- Junos OS Evolved
- 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 | 20.4R2-S3-EVO | Unavailable | None listed |
| 21.1R1-EVO | affected | custom | 21.1* | Unavailable | None listed |