CVE-2023-50481Network attack vector

Proxy traffic disclosure via RC4 and fixed IVs

Published Dec 21, 2023 · Updated Aug 2, 2024

Cryptographic weakness in blinksocks 3.3.8 allows remote attackers to disclose proxy traffic through the ssr-auth-chain preset. The preset uses RC4 for symmetric encryption at four code paths and supplies a non-random initialization vector to CBC and CFB operations. Exposure requires proxy traffic protected by the affected preset; published sources demonstrate information disclosure but not code execution or service interruption.

CVSS severity7.5
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cryptographic weakness in blinksocks 3.3.8 allows remote attackers to disclose proxy traffic through the ssr-auth-chain preset. The preset uses RC4 for symmetric encryption at four code paths and supplies a non-random initialization vector to CBC and CFB operations. Exposure requires proxy traffic protected by the affected preset; published sources demonstrate information disclosure but not code execution or service interruption.

The record

CVE
CVE-2023-50481
Published
Dec 21, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-327, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 21, 2023CVE 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?

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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1040Network Sniffing

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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