Privilege escalation in Juniper Junos
CVE-2021-0223
A local privilege escalation vulnerability in telnetd.real of Juniper Networks Junos OS may allow a locally authenticated shell user to escalate privileges and execute arbitrary commands as root. telnetd.real is shipped with setuid permissions enabled and is owned by the root user, allowing local users to run telnetd.real with root privileges. This issue affects Juniper Networks Junos OS: all versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S12, 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R2-S4, 18.3R3-S4; 18.4 versions prior to 18.4R2-S7, 18.4R3-S6; 19.1 versions prior to 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 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 20.1R1-S4, 20.1R2; 20.2 versions prior to 20.2R2.
EPSS: 0.004 (31.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Juniper Junos — versions 15.1, 17.3, 17.4
- Juniper Networks Junos Os — versions unspecified, 17.3, 17.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- sirt@juniper.net (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-0223?
- CVE-2021-0223 is a high-severity vulnerability in Juniper Junos, classified under CWE-250. CVSS score: 7.8/10. Published 2021-01-15.
- How severe is CVE-2021-0223?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-0223 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.