CVE-2021-42130Network attack vector

Remote code execution via unsafe deserialization

Published Dec 7, 2021 · Updated Aug 4, 2024

Deserialization in the DataRepository service in Ivanti Avalanche before 6.3.3 allows remote attackers to execute arbitrary code. DataRepository fails to validate user-supplied data before deserializing it, allowing attacker-controlled objects to execute code. Authentication ordinarily gates the service, but the mechanism can be bypassed; successful exploitation runs code as the service account.

CVSS severity8.8
High
EPSS probability62.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in the DataRepository service in Ivanti Avalanche before 6.3.3 allows remote attackers to execute arbitrary code. DataRepository fails to validate user-supplied data before deserializing it, allowing attacker-controlled objects to execute code. Authentication ordinarily gates the service, but the mechanism can be bypassed; successful exploitation runs code as the service account.

The record

CVE
CVE-2021-42130
Published
Dec 7, 2021
Updated
Aug 4, 2024
Vendor
Ivanti
Product
Avalanche
Classifications
CWE-502, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=6.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ivanti · Avalancheversion=6.3.3

Published CVSS scores

9.8Trend Micro Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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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
Privilegesunauthenticated
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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