CVE-2024-21664Public exploitNetwork attack vector

Service crash via missing protected-header dereference

Published Jan 9, 2024 · Updated Jun 17, 2025

Denial of service in lestrrat-go jwx 1.0.8 through 1.2.27 and 2.0.0 through 2.0.18 allows attackers to crash JWS-verifying systems via crafted JSON. Message.UnmarshalJSON assumes a signature includes a protected header and passes a nil sig.protected value to getB64Value, causing a pointer dereference. Reachability requires a consuming application to pass attacker-controlled full-JSON JWS input to Parse or Verify; the demonstrated consequence is a process panic.

CVSS severity4.3
Medium
EPSS probability0.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in lestrrat-go jwx 1.0.8 through 1.2.27 and 2.0.0 through 2.0.18 allows attackers to crash JWS-verifying systems via crafted JSON. Message.UnmarshalJSON assumes a signature includes a protected header and passes a nil sig.protected value to getB64Value, causing a pointer dereference. Reachability requires a consuming application to pass attacker-controlled full-JSON JWS input to Parse or Verify; the demonstrated consequence is a process panic.

The record

CVE
CVE-2024-21664
Published
Jan 9, 2024
Updated
Jun 17, 2025
Vendor
lestrrat-go
Product
jwx
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.0.8, < 1.2.28
  2. Affected versionversion=>= 2.0.0, < 2.0.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

lestrrat-go · jwxversion=>= 1.0.8, < 1.2.28; version=>= 2.0.0, < 2.0.19

Published CVSS scores

7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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.

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-476NULL Pointer Dereference
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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