CVE-2021-0254
A buffer size validation vulnerability in the overlayd service of Juniper Networks Junos OS may allow an unauthenticated remote attacker to send specially crafted packets to the device, triggering a partial Denial of Service (DoS) condition, or leading to remote code execution (RCE). Continued receipt and processing of these packets will sustain the partial DoS. The overlayd daemon handles Overlay OAM packets, such as ping and traceroute, sent to the overlay. The service runs as root by default and listens for UDP connections on port 4789. This issue results from improper buffer size validation, which can lead to a buffer overflow. Unauthenticated attackers can send specially crafted packets to trigger this vulnerability, resulting in possible remote code execution. overlayd runs by default in MX Series, ACX Series, and QFX Series platforms. The SRX Series does not support VXLAN and is therefore not vulnerable to this issue. Other platforms are also vulnerable if a Virtual Extensible LAN (VXLAN) overlay network is configured. This issue affects Juniper Networks Junos OS: 15.1 versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13, 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S7; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2, 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S1.
Scoring
- Severity
- CRITICAL
- CVSS base score
- 9.8
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS probability
- 0.64%
- CWE
- CWE-131
- Published
- 2021-04-22
- Last modified
- 2026-03-13
Affected products
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
Weakness type
Related vulnerabilities
- CVE-2023-36824 — Heap overflow in COMMAND GETKEYS and ACL evaluation in Redis
- CVE-2024-23622 — IBM Merge Healthcare eFilm Workstation License Server CopySLS_Request3 Buffer Overflow
- CVE-2024-23621 — IBM Merge Healthcare eFilm Workstation License Server Buffer Overflow
- CVE-2020-13585 — An out-of-bounds write vulnerability exists in the PSD Header processing functionality of Accusoft ImageGear 19.8. A spe
- CVE-2023-24819 — RIOT-OS vulnerable to Buffer Overflow during IPHC receive
- CVE-2022-22137 — A memory corruption vulnerability exists in the ioca_mys_rgb_allocate functionality of Accusoft ImageGear 19.10. A speci
- CVE-2021-21793 — An out-of-bounds write vulnerability exists in the JPG sof_nb_comp header processing functionality of Accusoft ImageGear
- CVE-2021-21782 — An out-of-bounds write vulnerability exists in the SGI format buffer size processing functionality of Accusoft ImageGear