CVE-2025-27611Network attack vector

Fund redirection via unchecked BASE_MAP indexing

Published Apr 30, 2025 · Updated May 1, 2025

Input validation error in cryptocoinjs base-x 4.0.0, 5.0.0, and before 3.0.11 allows attackers to redirect decoded addresses. The decoder indexes the 256-entry BASE_MAP with each UTF-16 character code but does not reject values above 255, so undefined entries bypass its invalid-character check and are decoded. An attacker must get a crafted encoded address processed and trusted by a consuming application; the resulting lookalike can direct funds to an unintended address.

CVSS severity8.7
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Input validation error in cryptocoinjs base-x 4.0.0, 5.0.0, and before 3.0.11 allows attackers to redirect decoded addresses. The decoder indexes the 256-entry BASE_MAP with each UTF-16 character code but does not reject values above 255, so undefined entries bypass its invalid-character check and are decoded. An attacker must get a crafted encoded address processed and trusted by a consuming application; the resulting lookalike can direct funds to an unintended address.

The record

CVE
CVE-2025-27611
Published
Apr 30, 2025
Updated
May 1, 2025
Vendor
cryptocoinjs
Product
base-x
Classifications
CWE-1007, T1565
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 30, 2025CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=< 3.0.11
  2. Affected versionversion== 4.0.0
  3. Affected versionversion== 5.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

cryptocoinjs · base-xversion=< 3.0.11; version== 4.0.0; version== 5.0.0

Published CVSS scores

8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA: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-1007Insufficient Visual Distinction of Homoglyphs Presented to User
T1565Data 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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