Arista EOS Dataplane Denial of Service via Malformed IPsec Packet

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Summary

CVECVE-2025-8873
StatePUBLISHED
AssignerArista
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-04 23:16:48 UTC
Updated2026-06-05 15:02:34 UTC
DescriptionOn affected platforms running Arista EOS with IPsec configured, a specially crafted packet can cause the dataplane to stop processing all IPsec traffic. The control plane may detect this condition, and attempt to reset the IPsec processing pipeline. After reset traffic may not resume being processed. There is no impact to non-IPsec traffic or to IPsec traffic not originating or terminating on the system. This issue was reported by an Arista customer.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.000260000 probability, percentile 0.077240000 (date 2026-06-10)

Problem Types: CWE-1286 | CWE-1286 CWE-1286: Improper Validation of Syntactic Correctness of Input

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Arista Networks EOS affected 4.33.0M 4.33.4M custom 7020SRG Series
CNA Arista Networks EOS affected 4.32.0M 4.32.6.1M custom 7020SRG Series
CNA Arista Networks EOS affected 4.31.0M 4.31.7.1M custom 7020SRG Series
CNA Arista Networks EOS affected 4.30.0M 4.30.10M custom 7020SRG Series
CNA Arista Networks EOS affected 4.29.0M 4.29.10.1M custom 7020SRG Series

References

ReferenceSourceLinkTags
www.arista.com/en/support/advisories-notices/security-advisory/22869-securit... [email protected] www.arista.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below. For more information about upgrading see  https://www.arista.com/en/support/toi/tcam-profile?pn=ipsec-egress-padding-removal . This may momentarily impact traffic. Apply the configuration found at the url to create a TCAM profile and then apply the TCAM profile as shown below. switch(config)#hardware tcam switch(config-tcam)#system profile ipsec-egress-padding-removal ! WARNING! Changing TCAM profile will cause forwarding agent(s) to exit and restart. All traffic through the forwarding chip managed by the restarting forwarding agent will be dropped. Proceed [y/n]y switch(config-tcam)#   To ensure the TCAM profile has been applied, run the following command and verify the Configuration and Status values match ipsec-egress-padding-removal: switch(config-tcam)#show hardware tcam profile                      Configuration            Status FixedSystem          ipsec-egress-padding-removal ipsec-egress-padding-removal   ‘ipsec-egress-padding-removal’ differs from the ‘ipsec’ TCAM profile in two ways: * Egress IP ACLs are disabled * Fixes for BUG603398 and BUG1246592 are applied

Workarounds

CNA: There are no mitigations for this vulnerability.

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