CVE-2022-25139Public exploit

Process crash via recursive async use-after-free

Published Feb 14, 2022 · Updated Aug 3, 2024

Use-after-free in the async interpreter in NGINX njs 0.7.0 allows context-dependent attackers to crash the executing process. Recursive async calls store promise and await state on the shared function object, so an inner call overwrites state used after its frame is freed. Exploitation requires execution of attacker-controlled JavaScript; njs does not evaluate network-supplied code and treats imported scripts as trusted configuration.

CVSS severity9.8
Critical
EPSS probability1.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the async interpreter in NGINX njs 0.7.0 allows context-dependent attackers to crash the executing process. Recursive async calls store promise and await state on the shared function object, so an inner call overwrites state used after its frame is freed. Exploitation requires execution of attacker-controlled JavaScript; njs does not evaluate network-supplied code and treats imported scripts as trusted configuration.

The record

CVE
CVE-2022-25139
Published
Feb 14, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 14, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
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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