#VU52321 Buffer overflow in Juniper Junos OS and EX4300 - CVE-2021-0242

Vulnerability identifier: #VU52321

Vulnerability risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-0242

CWE-ID: CWE-119

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system
EX4300
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Juniper Networks, Inc.

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the improper handling of direct memory access (DMA) buffers. A remote attacker on the local network can trigger memory corruption and cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 17.3R1-S1 - 17.3, 17.4R1-S1 - 17.4, 18.1R1 - 18.1, 18.2R1-S3 - 18.2R3, 18.3R1-S1 - 18.3R3, 18.4R1-S1 - 18.4R3, 19.1R - 19.1R3, 19.2R1-S1 - 19.2R3, 19.3R1-S1 - 19.3R3, 19.4R1-S1 - 19.4R3, 20.1R1-S1 - 20.1R2, 20.2R1-S1 - 20.2R2, 20.3R1

EX4300: All versions

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External links
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11135&cat=SIRT_1&actp=LIST

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.