TerminAttr streams MACsec sensitive data in clear text to other authorized users in CVP

published 2022-05-26 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-15185

cvss: 6.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

arista terminattr 1.10.11, 1.16.8, 1.19.2
arista eos 4.24.10, 4.25.8, 4.26.6, 4.27.4

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

arista.com https://www.arista.com/en/support/advisories-notices/security-advisories/15484-security-advisory-0077 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N
NVD	2.0	3.6	AV:N/AC:H/Au:S/C:P/I:P/A:N

Affected products

Arista Networks Arista EOS
Arista Networks Arista TerminAttr

Classification

Weakness

CWE-255 Credentials Management Errors
CWE-319 Cleartext Transmission of Sensitive Information

References

arista.com /en/support/advisories-notices/security-advisories/15484-security-advisory-0077
exploit, vendor-advisory

Sources

CVE List CVE-2021-28509
NVD CVE-2021-28509

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary