High severity · published Jan 14, 2022
CVE-2021-28507
An issue has recently been discovered in Arista EOS where, under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed,…
7.1
CVSS
0.7%
EPSS
No
On KEV
Description
An issue has recently been discovered in Arista EOS where, under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed, which results in the denied requests being forwarded to the agent.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EO
Eos · Arista
4.23.0 through 4.23.9m; 4.24.0 through 4.24.7m; 4.25.0 through 4.25.3; 4.25.4 through 4.25.4m; 4.25.5 through 4.25.5.1m; 4.26.0 through 4.26.2f; +5 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-28507
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-28507
Exploit
https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071
More from Eos
9.8
CVE-2014-7169
GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability
9.8
CVE-2014-6271
GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability
5.8
CVE-2026-7473
Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
9.8
CVE-2021-28503
The impact of this vulnerability is that Arista's EOS eAPI may skip re-evaluating user credentials when certificate based authentication is used, which allows remote attackers to…
9.8
CVE-2020-10188
utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes or urgent data, because of a buffer overflow involving the…