CVE-2021-28509: arista networks arista eos Credentials Management Errors
Vulnerability summary
CVE-2021-28509 is a medium (CVSS 6.1) Credentials Management Errors vulnerability in arista networks arista eos. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 39.3% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 26-05-2022PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 2 sources · 2 versions- NVDNIST6.1MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N
EPSS trend
Probability
0.47%
Chance of exploitation in the next 30 days
Percentile
39%
Versus all other CVEs
30-day change
+0.01 pp
From 0.46% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (arista.com)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-255Credentials Management ErrorsWeaknesses in this category are related to the management of credentials.
- CWE-319Cleartext Transmission of Sensitive InformationThe product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.
Affected systems
Arista2 products
- eos≥ 4.23, ≤ 4.23.11 | ≥ 4.24, < 4.24.10 | ≥ 4.25, < 4.25.8 | ≥ 4.26, < 4.26.6 | ≥ 4.27, < 4.27.4
- terminattr< 1.10.11 | ≥ 1.11.0, < 1.16.8 | ≥ 1.17.0, < 1.19.2
Arista networks2 products
- arista eos≥ 4.23, ≤ 4.23.11 | ≥ 4.24, ≤ 4.24.9 | ≥ 4.25, ≤ 4.25.7 | ≥ 4.26, ≤ 4.26.5 | ≥ 4.27, ≤ 4.27.3
- arista terminattr≥ v1.10, ≤ v1.10.10 | ≥ v1.16, ≤ v1.16.7 | ≥ v1.19, ≤ v1.19.1
2 vendors · 4 products
References
1 links- www.arista.com/en/support/advisories-notices/security-advisories/15484-security-advisory-0077X Refsource MISCExploitVendor Advisory