CVE-2020-13583Network attack vector

Unauthenticated crash via NULL multipart-boundary pointer

Published Feb 10, 2021 · Updated Aug 4, 2024

NULL pointer dereference in Micrium uC-HTTP 3.01.00 allows remote attackers to crash the HTTP server with a crafted multipart request. HTTPsReq_HdrParse copies the multipart boundary through FormBoundaryPtr and terminates the string without checking that the pointer was allocated. The flaw is reachable when form and multipart handling are enabled while FormCfgPtr is NULL, causing the server task to fault.

CVSS severity7.5
High
EPSS probability1.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Micrium uC-HTTP 3.01.00 allows remote attackers to crash the HTTP server with a crafted multipart request. HTTPsReq_HdrParse copies the multipart boundary through FormBoundaryPtr and terminates the string without checking that the pointer was allocated. The flaw is reachable when form and multipart handling are enabled while FormCfgPtr is NULL, causing the server task to fault.

The record

CVE
CVE-2020-13583
Published
Feb 10, 2021
Updated
Aug 4, 2024
Vendor
Weston Embedded Solutions
Product
uC/HTTP
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 10, 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?

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

  1. Affected versionversion=Micrium uC-HTTP 3.01.00

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Weston Embedded Solutions · uC/HTTPversion=Micrium uC-HTTP 3.01.00

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.6Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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