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CVE-2021-28504— On Arista Strata family products which have “TCAM profile” feature enabled when Port IPv4 access-list has a rule which matches on “vxlan” as protocol then that rule and subsequent rules ( rules declared after it in ACL ) do not match on IP protocol fi ...

Quick assessment

Affected
Arista Networks EOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Arista Networks Arista Strata是美国Arista Networks公司的一个网络交换机。 Arista Strata存在安全漏洞，该漏洞源于当端口IPv4访问列表中有一条规则和作为协议的“vxlan”上的规则相匹配时，该规则和后续规则在IP协议字段上不匹配。

CVSS 7.5 · High EPSS 0.73% · P51

Possible ATT&CK Techniques 1 AI

T1564.004 · NTFS File Attributes
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I. Basic Information for CVE-2021-28504

Vulnerability Information
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Vulnerability Title
On Arista Strata family products which have “TCAM profile” feature enabled when Port IPv4 access-list has a rule which matches on “vxlan” as protocol then that rule and subsequent rules ( rules declared after it in ACL ) do not match on IP protocol fi ...
Source: CVE Program / CVE List V5
Vulnerability Description
On Arista Strata family products which have “TCAM profile” feature enabled when Port IPv4 access-list has a rule which matches on “vxlan” as protocol then that rule and subsequent rules ( rules declared after it in ACL ) do not match on IP protocol field as expected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Arista Strata 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Arista Networks Arista Strata是美国Arista Networks公司的一个网络交换机。 Arista Strata存在安全漏洞，该漏洞源于当端口IPv4访问列表中有一条规则和作为协议的“vxlan”上的规则相匹配时，该规则和后续规则在IP协议字段上不匹配。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Arista Networks EOS 4.26.3F ~ 4.26.0 -

II. Public POCs for CVE-2021-28504

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III. Intelligence Information for CVE-2021-28504

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Other References for CVE-2021-28504 (1)

IV. Related Vulnerabilities

Same product: EOS
Same vendor: Arista Networks
Same weakness: CWE-284

V. Comments for CVE-2021-28504

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