CVE-2020-13582Network attack vector

Remote crash via unchecked multipart boundary lookup

Published Jan 26, 2021 · Updated Aug 4, 2024

Unchecked return handling in Weston Embedded Solutions uC/HTTP 3.01.00 allows remote attackers to crash the HTTP server via a crafted multipart request. The HTTPsReq_HdrParse function increments the null result of Str_Char_N when a multipart boundary lacks an equals sign, then HTTP_StrGraphSrchFirst dereferences address 0x01. No authentication or user interaction is required; the malformed request causes an invalid memory access that terminates the server.

CVSS severity7.5
High
EPSS probability2.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unchecked return handling in Weston Embedded Solutions uC/HTTP 3.01.00 allows remote attackers to crash the HTTP server via a crafted multipart request. The HTTPsReq_HdrParse function increments the null result of Str_Char_N when a multipart boundary lacks an equals sign, then HTTP_StrGraphSrchFirst dereferences address 0x01. No authentication or user interaction is required; the malformed request causes an invalid memory access that terminates the server.

The record

CVE
CVE-2020-13582
Published
Jan 26, 2021
Updated
Aug 4, 2024
Vendor
Weston Embedded Solutions
Product
uC/HTTP
Classifications
CWE-690, CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 26, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

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
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.

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-690Unchecked Return Value to NULL Pointer Dereference
CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation Flood

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo