CVE-2025-2796Network attack vector

Traffic replay via duplicate IPsec packet forwarding

Published May 27, 2025 · Updated May 28, 2025

Improper access control in Arista EOS 4.33.0 through 4.33.2F and 4.34.0F allows remote attackers to forward replayed IPsec packets. The hardware IPsec forwarding path accepts duplicate ciphertext instead of dropping it when anti-replay detection is enabled. A listed 7280R3 or 7800R3 platform, IPsec, and an SA policy with anti-replay detection are required; VXLANSec and MACSec are unaffected.

CVSS severity5.3
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Arista EOS 4.33.0 through 4.33.2F and 4.34.0F allows remote attackers to forward replayed IPsec packets. The hardware IPsec forwarding path accepts duplicate ciphertext instead of dropping it when anti-replay detection is enabled. A listed 7280R3 or 7800R3 platform, IPsec, and an SA policy with anti-replay detection are required; VXLANSec and MACSec are unaffected.

The record

CVE
CVE-2025-2796
Published
May 27, 2025
Updated
May 28, 2025
Vendor
Arista Networks
Product
Arista EOS
Classifications
CWE-284, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2025CVE publishedPublication date reported by the CVE source.
  2. May 28, 2025Record 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=4.33.0 <=4.33.2F

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arista Networks · Arista EOSversion=4.33.0 <=4.33.2F

Published CVSS scores

5.3Arista NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-284Improper Access Control
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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