CVE-2025-8873Network attack vector

IPsec traffic interruption via malformed packet

Published Jun 4, 2026 · Updated Jun 4, 2026

Improper input validation in Arista EOS on 7020SRG Series switches allows remote attackers to interrupt IPsec traffic via a crafted packet. The IPsec dataplane accepts malformed packet syntax and enters a state that stops processing all IPsec traffic; an attempted pipeline reset does not reliably restore it. IPsec must be configured, and only IPsec traffic originating or terminating on the affected switch is interrupted; other traffic remains unaffected.

CVSS severity7.5
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Arista EOS on 7020SRG Series switches allows remote attackers to interrupt IPsec traffic via a crafted packet. The IPsec dataplane accepts malformed packet syntax and enters a state that stops processing all IPsec traffic; an attempted pipeline reset does not reliably restore it. IPsec must be configured, and only IPsec traffic originating or terminating on the affected switch is interrupted; other traffic remains unaffected.

The record

CVE
CVE-2025-8873
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Arista Networks
Product
Arista Extensible Operating System (EOS)
Classifications
CWE-1286, CAPEC-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.29.0M <=4.29.10.1M
  2. Affected versionversion=4.30.0M <=4.30.10M
  3. Affected versionversion=4.31.0M <=4.31.7.1M
  4. Affected versionversion=4.32.0M <=4.32.6.1M
  5. Affected versionversion=4.33.0M <=4.33.4M

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arista Networks · Arista Extensible Operating System (EOS)version=4.29.0M <=4.29.10.1M; version=4.30.0M <=4.30.10M; version=4.31.0M <=4.31.7.1M; version=4.32.0M <=4.32.6.1M; version=4.33.0M <=4.33.4M

Published CVSS scores

8.7Arista NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5Arista NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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-1286Improper Validation of Syntactic Correctness of Input
CAPEC-125Flooding
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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