CVE-2020-20665Public exploitNetwork attack vector

Remote denial of service via unreleased allocation

Published Sep 30, 2021 · Updated Aug 4, 2024

Memory leak in main.c in rudp 0.6 allows remote attackers to crash the process via unauthenticated network traffic. Code at main.c line 90 fails to release a 120-byte allocation during the published AddressSanitizer reproduction, allowing memory consumption to accumulate. No credentials or user interaction are required, but the public report does not identify the packet sequence needed to repeat the leak and crash the process.

CVSS severity7.5
High
EPSS probability1.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in main.c in rudp 0.6 allows remote attackers to crash the process via unauthenticated network traffic. Code at main.c line 90 fails to release a 120-byte allocation during the published AddressSanitizer reproduction, allowing memory consumption to accumulate. No credentials or user interaction are required, but the public report does not identify the packet sequence needed to repeat the leak and crash the process.

The record

CVE
CVE-2020-20665
Published
Sep 30, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-401, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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 exploitPublished

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

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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