CVE-2025-53393Network attack vector

Application-state manipulation via deserialized cluster metrics

Published Jun 28, 2025 · Updated Jun 30, 2025

Unsafe deserialization in Lightbend Akka 2.10.6 and earlier allows remote authenticated users to alter application behavior via cluster metrics. MessageSerializer passes a serialized Number payload from a cluster metric to ClassLoaderObjectInputStream.readObject without restricting the resulting class. Exploitation requires cluster access and an application with the Cluster Metrics Extension enabled, exposing application data and service state to limited alteration or interruption.

CVSS severity6.0
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

Unsafe deserialization in Lightbend Akka 2.10.6 and earlier allows remote authenticated users to alter application behavior via cluster metrics. MessageSerializer passes a serialized Number payload from a cluster metric to ClassLoaderObjectInputStream.readObject without restricting the resulting class. Exploitation requires cluster access and an application with the Cluster Metrics Extension enabled, exposing application data and service state to limited alteration or interruption.

The record

CVE
CVE-2025-53393
Published
Jun 28, 2025
Updated
Jun 30, 2025
Vendor
Lightbend
Product
Akka
Classifications
CWE-502, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 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=0 <=2.10.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Lightbend · Akkaversion=0 <=2.10.6

Published CVSS scores

6.0MITRECVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1210Exploitation of Remote Services

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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