CVE-2025-7048

Dataplane disruption via malformed MACsec packets

Published Jan 6, 2026 · Updated Jan 6, 2026

Denial of service in affected Arista EOS releases allows attackers to restart the MACsec process with a crafted adjacent-network packet. The Macsec agent interprets malformed length or encrypted data, triggering an allocation-overflow or cryptographic-error assertion and SIGABRT. Exposure requires at least one active MACsec profile; repeated packets can disrupt dataplane traffic beyond a single agent restart.

CVSS severity5.3
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Arista EOS releases allows attackers to restart the MACsec process with a crafted adjacent-network packet. The Macsec agent interprets malformed length or encrypted data, triggering an allocation-overflow or cryptographic-error assertion and SIGABRT. Exposure requires at least one active MACsec profile; repeated packets can disrupt dataplane traffic beyond a single agent restart.

The record

CVE
CVE-2025-7048
Published
Jan 6, 2026
Updated
Jan 6, 2026
Vendor
Arista Networks
Product
Arista Extensible Operating System (EOS)
Classifications
CWE-805, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 6, 2026Record 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=0 <4.30.0
  2. Affected versionversion=4.31.0 <=4.31.9M
  3. Affected versionversion=4.32.0 <=4.32.7M
  4. Affected versionversion=4.33.0 <=4.33.5M
  5. Affected versionversion=4.34.3.0 <=4.34.3.1M

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Arista Networks · Arista Extensible Operating System (EOS)version=0 <4.30.0; version=4.31.0 <=4.31.9M; version=4.32.0 <=4.32.7M; version=4.33.0 <=4.33.5M; version=4.34.3.0 <=4.34.3.1M

Published CVSS scores

4.3Arista NetworksCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3Arista NetworksCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-805Buffer Access with Incorrect Length Value
T1499.004Application or System Exploitation

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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