CVE-2021-28511
Last modified
CVE-2021-28511 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. This advisory documents the impact of an internally found vulnerability in Arista EOS for security ACL bypass. The impact of this vulnerability is that the security ACL drop rule might be bypassed if a NAT ACL rule filter with permit action matches the packet flow. EPSS estimates a 0.49% chance of exploitation in the next 30 days.
Description
This advisory documents the impact of an internally found vulnerability in Arista EOS for security ACL bypass. The impact of this vulnerability is that the security ACL drop rule might be bypassed if a NAT ACL rule filter with permit action matches the packet flow. This could allow a host with an IP address in a range that matches the range allowed by a NAT ACL and a range denied by a Security ACL to be forwarded incorrectly as it should have been denied by the Security ACL. This can enable an ACL bypass.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Arista | Eos | <= 4.24.9 |
| Arista | Eos | >= 4.25.0, <= 4.25.8 |
| Arista | Eos | >= 4.26.0, <= 4.26.5 |
| Arista | Eos | >= 4.27.0, <= 4.27.3 |
References
- https://www.arista.com/en/support/advisories-notices/security-advisory/15862-security-advisory-0078Exploit, Mitigation, Vendor Advisory
- https://www.arista.com/en/support/advisories-notices/security-advisory/15862-security-advisory-0078Exploit, Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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