CVE-2023-24623Network attack vector

SSRF via IPv6 unspecified-address filter bypass

Published Jan 30, 2023 · Updated Mar 28, 2025

SSRF in Paranoidhttp before 0.3.0 allows remote attackers to send requests to loopback services through an IPv6 unspecified address. The safeAddr function accepts [::] because it checks forbidden ranges only after converting an address to IPv4, while connections to [::] reach the local host. Exploitation requires an application to pass attacker-controlled URLs to this client and permits requests to services bound to the local host.

CVSS severity7.5
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Paranoidhttp before 0.3.0 allows remote attackers to send requests to loopback services through an IPv6 unspecified address. The safeAddr function accepts [::] because it checks forbidden ranges only after converting an address to IPv4, while connections to [::] reach the local host. Exploitation requires an application to pass attacker-controlled URLs to this client and permits requests to services bound to the local host.

The record

CVE
CVE-2023-24623
Published
Jan 30, 2023
Updated
Mar 28, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 28, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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-918Server-Side Request Forgery (SSRF)

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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