Denial of service in Junos OS ARP processing



| Updated: 2022-03-22
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-0271
CWE-ID CWE-415
Exploitation vector Local network
Public exploit N/A
Vulnerable software
 Juniper Junos OS
Operating systems & Components / Operating system

Vendor Juniper Networks, Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Double Free

EUVDB-ID: #VU61514

Risk: Medium

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:Green]

CVE-ID: CVE-2021-0271

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in the software forwarding interface daemon (sfid) process. A remote attacker on the local network can send a specially crafted ARP packet to the affected device and perform a denial of service (DoS) attack.


Mitigation

Install updates from vendor's website.

The vulnerability affects Juniper Networks Junos OS on EX2200-C Series, EX3200 Series, EX3300 Series, EX4200 Series, EX4500 Series, EX4550 Series, EX6210 Series, EX8208 Series, EX8216 Series.

Vulnerable software versions

Juniper Junos OS: 12.3R12-S1 - 15.1F7

CPE2.3 External links

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11162&cat=SIRT_1&actp=LIST


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.



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