CVE-2025-53620Public exploitNetwork attack vector

Server crash via uncaught QRL load error

Published Jul 9, 2025 · Updated Jul 9, 2025

Uncaught exception in QwikDev Qwik City before 1.13.0 allows remote attackers to crash Node.js through malformed Server Action QRL requests. The Server Action QRL loader accepts a matching qfunc parameter, X-Qrl header, and serialized QRL payload, then leaves a failed dynamic symbol import unhandled. An unauthenticated HTTP request reaches the default preview or Express production configuration, terminating Node.js and interrupting service until restart.

CVSS severity9.2
Critical
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught exception in QwikDev Qwik City before 1.13.0 allows remote attackers to crash Node.js through malformed Server Action QRL requests. The Server Action QRL loader accepts a matching qfunc parameter, X-Qrl header, and serialized QRL payload, then leaves a failed dynamic symbol import unhandled. An unauthenticated HTTP request reaches the default preview or Express production configuration, terminating Node.js and interrupting service until restart.

The record

CVE
CVE-2025-53620
Published
Jul 9, 2025
Updated
Jul 9, 2025
Vendor
QwikDev
Product
Qwik
Classifications
CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 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=< 1.13.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

QwikDev · Qwikversion=< 1.13.0

Published CVSS scores

9.2GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-248Uncaught Exception
T1499.004Application or System Exploitation

Public exploit references

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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