CVE-2021-3703Network attack vector

Denial of service via incomplete Go updates

Published Aug 26, 2022 · Updated Aug 3, 2024

Incomplete dependency fixes in Red Hat OpenShift Serverless before 1.17.0 allow remote attackers to interrupt affected services. Serverless 1.16.0 retained Go library flaws in which XML token decoding loops indefinitely, oversized HTTP headers cause a panic, and malformed ZIP archives cause a panic or memory exhaustion. Exploitation requires an affected component to process crafted XML, HTTP, or ZIP input; Red Hat does not identify which deployed endpoints expose each parser.

CVSS severity7.5
High
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incomplete dependency fixes in Red Hat OpenShift Serverless before 1.17.0 allow remote attackers to interrupt affected services. Serverless 1.16.0 retained Go library flaws in which XML token decoding loops indefinitely, oversized HTTP headers cause a panic, and malformed ZIP archives cause a panic or memory exhaustion. Exploitation requires an affected component to process crafted XML, HTTP, or ZIP input; Red Hat does not identify which deployed endpoints expose each parser.

The record

CVE
CVE-2021-3703
Published
Aug 26, 2022
Updated
Aug 3, 2024
Vendor
Red Hat
Product
Red Hat OpenShift Serverless
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=Fixed in Serverless 1.17.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · Red Hat OpenShift Serverlessversion=Fixed in Serverless 1.17.0

Published CVSS scores

7.5NIST NVDCVSS: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.

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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

T1499Endpoint Denial of Service

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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