CVE-2023-45813Public exploit

Application crash via exponential URL regex

Published Oct 18, 2023 · Updated Sep 13, 2024

Regular expression denial of service in DedSecInside TorBot before 4.0.0 allows physically proximate attackers to crash it via a crafted URL. The torbot.modules.validators.validate_link function passes the URL argument to python-validators, whose regex has exponential worst-case complexity. Reachability requires supplying a URL argument directly to a TorBot invocation; the resulting CPU exhaustion hangs or crashes that process without reported data exposure or modification.

CVSS severity4.6
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in DedSecInside TorBot before 4.0.0 allows physically proximate attackers to crash it via a crafted URL. The torbot.modules.validators.validate_link function passes the URL argument to python-validators, whose regex has exponential worst-case complexity. Reachability requires supplying a URL argument directly to a TorBot invocation; the resulting CPU exhaustion hangs or crashes that process without reported data exposure or modification.

The record

CVE
CVE-2023-45813
Published
Oct 18, 2023
Updated
Sep 13, 2024
Vendor
DedSecInside
Product
TorBot
Classifications
CWE-1333, T1499.004
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 13, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.0.0

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

DedSecInside · TorBotversion=< 4.0.0

Published CVSS scores

4.6GitHubCVSS:3.1/AV:P/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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
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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