Arista EOS up to 4.33.4M IPsec improper validation of syntactic correctness of input

CVSS Meta Temp Score
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CTI Interest Score
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7.5$0-$5k3.01-

Summaryinfo

A vulnerability marked as critical has been reported in Arista EOS up to 4.29.10.1M/4.30.10M/4.31.7.1M/4.32.6.1M/4.33.4M. This vulnerability affects unknown code of the component IPsec Handler. The manipulation leads to improper validation of syntactic correctness of input. This vulnerability is referenced as CVE-2025-8873. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Arista EOS up to 4.29.10.1M/4.30.10M/4.31.7.1M/4.32.6.1M/4.33.4M. It has been rated as critical. This issue affects an unknown code of the component IPsec Handler. The manipulation with an unknown input leads to a improper validation of syntactic correctness of input vulnerability. Using CWE to declare the problem leads to CWE-1286. The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax. Impacted is availability. The summary by CVE is:

On 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.

It is possible to read the advisory at arista.com. The identification of this vulnerability is CVE-2025-8873 since 08/11/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.5
VulDB Temp Score: 7.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (Arista): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper validation of syntactic correctness of input
CWE: CWE-1286 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

08/11/2025 CVE reserved
06/05/2026 +298 days Advisory disclosed
06/05/2026 +0 days VulDB entry created
06/05/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: arista.com
Status: Confirmed

CVE: CVE-2025-8873 (🔒)
GCVE (CVE): GCVE-0-2025-8873
GCVE (VulDB): GCVE-100-368855

Entryinfo

Created: 06/05/2026 08:08
Changes: 06/05/2026 08:08 (73)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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