CVE-2021-28496

Authenticated BFD password disclosure via JSON output

Published Oct 21, 2021 · Updated Sep 16, 2024

Information disclosure in Arista EOS 4.22 through 4.26.1 allows remote authenticated users to read BFD shared-secret passwords via eAPI JSON output. The shared-secret profile serializer returns the BFD password in eAPI and other JSON command output instead of redacting it. Exploitation requires an authenticated account on the device and a configured shared-secret profile; the consequence is disclosure of the BFD credential.

CVSS severity5.7
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Arista EOS 4.22 through 4.26.1 allows remote authenticated users to read BFD shared-secret passwords via eAPI JSON output. The shared-secret profile serializer returns the BFD password in eAPI and other JSON command output instead of redacting it. Exploitation requires an authenticated account on the device and a configured shared-secret profile; the consequence is disclosure of the BFD credential.

The record

CVE
CVE-2021-28496
Published
Oct 21, 2021
Updated
Sep 16, 2024
Vendor
Arista Networks
Product
Arista EOS
Classifications
CWE-522, CWE-311
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=EOS-4.22 <=EOS-4.22.12
  2. Affected versionversion=EOS-4.23 <EOS-4.23.10
  3. Affected versionversion=EOS-4.24 <EOS-4.24.8
  4. Affected versionversion=EOS-4.25 <EOS-4.25.5
  5. Affected versionversion=EOS-4.26 <EOS-4.26.2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Arista Networks · Arista EOSversion=EOS-4.22 <=EOS-4.22.12; version=EOS-4.23 <EOS-4.23.10; version=EOS-4.24 <EOS-4.24.8; version=EOS-4.25 <EOS-4.25.5; version=EOS-4.26 <EOS-4.26.2

Published CVSS scores

5.7Arista Networks, Inc.CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
CWE-311Missing Encryption of Sensitive Data

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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