8.7

CVE-2025-27611: base-x homograph attack allows Unicode lookalike characters to bypass validation.

Deferred
AliasesGHSA-xq7p-g2vc-g82p
Published 30-04-2025Last modified 01-05-2025

Vulnerability summary

CVE-2025-27611 is a high (CVSS 8.7) vulnerability in cryptocoinjs base-x. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 39.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.7 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.45%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2
RHSA-2025:10452RHSA-2025:10453

Timeline

  1. 30-04-2025
    PublishedVulnerability first disclosed.
  2. 01-05-2025
    Last modifiedVulnerability information updated.

Description

base-x is a base encoder and decoder of any given alphabet using bitcoin style leading zero compression. Versions 4.0.0, 5.0.0, and all prior to 3.0.11, are vulnerable to attackers potentially deceiving users into sending funds to an unintended address. This issue has been patched in versions 3.0.11, 4.0.1, and 5.0.1.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.45% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Cryptocoinjs1 product
  • base-x= 5.0.0 | = 4.0.0 | < 3.0.11
Npm1 product
  • base-x≥ 5.0.0, < 5.0.1 | ≥ 4.0.0, < 4.0.1 | < 3.0.11

2 vendors · 2 products

References

4 links