Is CVE-2021-28509 in the CISA KEV catalog?

No. CVE-2021-28509 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-28509?

CVE-2021-28509 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2021-28509?

CVE-2021-28509 has an EPSS score of 0.44% (35th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-28509?

Upgrade eos to 4.27.4 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-28509

MEDIUM

6.1

CVSS v3

NVD

Description

This advisory documents the impact of an internally found vulnerability in Arista EOS state streaming telemetry agent TerminAttr and OpenConfig transport protocols. The impact of this vulnerability is that, in certain conditions, TerminAttr might leak MACsec sensitive data in clear text in CVP to other authorized users, which could cause MACsec traffic to be decrypted or modified by other authorized users on the device.

CWE-255 CWE-319

How to fix

Remediation Available

eosNVD

Affected:>= 4.27, < 4.27.4Fixed in:4.27.4CVE-2021-28509derived from NVD

terminattrNVD

Affected:>= 1.17.0, < 1.19.2Fixed in:1.19.2CVE-2021-28509derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N

Exploit Intelligence

0.44%probability of exploitation in 30 days

35thpercentile

Low risk: more likely to be exploited than 35% of all known CVEs.

References

Exploit1

arista.com

Embed a live status badge for CVE-2021-28509

Markdown

[![CVE-2021-28509](https://tridentstack.com/cve/badge/CVE-2021-28509.svg)](https://tridentstack.com/cve/CVE-2021-28509)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-28509"><img src="https://tridentstack.com/cve/badge/CVE-2021-28509.svg" alt="CVE-2021-28509"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.