CVE-2024-36277Network attack vector

Event data forgery via missing signature rejection

Published Jun 17, 2024 · Updated Aug 2, 2024

Improper signature verification in FreeFrom - the nostr client before 1.3.5 allows remote attackers to supply invalid Nostr event data. The app's event-validation path accepts event data without detecting that its cryptographic signature is invalid; public sources do not identify the responsible function or failed check. No privileges or user interaction are required, and the documented consequence is limited to accepting untrusted event data as valid.

CVSS severity5.3
Medium
EPSS probability0.26%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in FreeFrom - the nostr client before 1.3.5 allows remote attackers to supply invalid Nostr event data. The app's event-validation path accepts event data without detecting that its cryptographic signature is invalid; public sources do not identify the responsible function or failed check. No privileges or user interaction are required, and the documented consequence is limited to accepting untrusted event data as valid.

The record

CVE
CVE-2024-36277
Published
Jun 17, 2024
Updated
Aug 2, 2024
Vendor
FreeFrom K.K.
Product
FreeFrom - the nostr client
Classifications
CWE-347, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=0 <1.3.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeFrom K.K. · FreeFrom - the nostr clientversion=0 <1.3.5
FreeFrom K.K. · FreeFrom - the nostr client Appversion=prior to 1.3.5

Published CVSS scores

5.3JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1565.002Transmitted Data Manipulation

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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