CVE-2024-24790Network attack vector

Address-check bypass via unnormalized IPv4-mapped IPv6 input

Published Jun 5, 2024 · Updated Feb 13, 2025

Incorrect IP classification in net/netip before 1.21.11 and 1.22.0 through 1.22.3 allows attackers to bypass address checks. The affected Addr.IsPrivate, Addr.IsLoopback, and related predicates classify IPv4-mapped IPv6 inputs without first applying their IPv4 form, causing mapped private, loopback, or multicast addresses to return false. Impact requires a consuming program to rely on these results for a security decision; the package documentation states that IsPrivate does not describe a security property.

CVSS severity9.8
Critical
EPSS probability1.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect IP classification in net/netip before 1.21.11 and 1.22.0 through 1.22.3 allows attackers to bypass address checks. The affected Addr.IsPrivate, Addr.IsLoopback, and related predicates classify IPv4-mapped IPv6 inputs without first applying their IPv4 form, causing mapped private, loopback, or multicast addresses to return false. Impact requires a consuming program to rely on these results for a security decision; the package documentation states that IsPrivate does not describe a security property.

The record

CVE
CVE-2024-24790
Published
Jun 5, 2024
Updated
Feb 13, 2025
Vendor
Transportes Metropolitanos de Lisboa
Product
GO
Classifications
CWE-180
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=0 <1.21.11
  2. Affected versionversion=1.22.0-0 <1.22.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Transportes Metropolitanos de Lisboa · GOversion=0 <1.21.11; version=1.22.0-0 <1.22.4
Go standard library · net/netipversion=0 <1.21.11; version=1.22.0-0 <1.22.4

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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-180Incorrect Behavior Order: Validate Before Canonicalize

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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