CVE-2025-54581Public exploitNetwork attack vector

Unauthenticated proxy crash via zero TTL

Published Jul 30, 2025 · Updated Jul 30, 2025

Divide by zero in vproxy 2.3.3 and earlier allows remote attackers to crash the proxy via a crafted Proxy-Authorization header. The parse_ttl_extension function accepts zero as a u64 TTL and uses it as the divisor in timestamp % ttl, causing a Rust panic. No authentication or user interaction is required; the process exits and proxy service remains unavailable until restarted.

CVSS severity7.5
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide by zero in vproxy 2.3.3 and earlier allows remote attackers to crash the proxy via a crafted Proxy-Authorization header. The parse_ttl_extension function accepts zero as a u64 TTL and uses it as the divisor in timestamp % ttl, causing a Rust panic. No authentication or user interaction is required; the process exits and proxy service remains unavailable until restarted.

The record

CVE
CVE-2025-54581
Published
Jul 30, 2025
Updated
Jul 30, 2025
Vendor
0x676e67
Product
vproxy
Classifications
CWE-369, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 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=< 2.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

0x676e67 · vproxyversion=< 2.4.0

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-369Divide By Zero
T1499.004Application or System Exploitation

Public exploit references

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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