---
id: CVE-2020-8231
title: >-
  Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the
  wrong connection when sending data.
summary: >-
  Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the
  wrong connection when sending data.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-416
  - CWE-416
vendor: haxx
product: libcurl
affected:
  - 'libcurl >= 7.29.0, <= 7.71.1'
  - sinec_infrastructure_network_services < 1.0.1.1
  - debian_linux = 10.0
  - communications_cloud_native_core_policy = 1.14.0
  - 'universal_forwarder >= 8.2.0, < 8.2.12'
  - 'universal_forwarder >= 9.0.0, < 9.0.6'
  - universal_forwarder = 9.1.0
patched:
  - sinec_infrastructure_network_services 1.0.1.1
  - universal_forwarder 9.0.6
published: '2020-12-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T09:17:20.017'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-8231'
references:
  - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf'
    label: support@hackerone.com
  - url: 'https://curl.haxx.se/docs/CVE-2020-8231.html'
    label: support@hackerone.com
  - url: 'https://hackerone.com/reports/948876'
    label: support@hackerone.com
  - url: >-
      https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    label: support@hackerone.com
  - url: >-
      https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    label: support@hackerone.com
  - url: 'https://security.gentoo.org/glsa/202012-14'
    label: support@hackerone.com
  - url: 'https://www.debian.org/security/2021/dsa-4881'
    label: support@hackerone.com
  - url: 'https://www.oracle.com/security-alerts/cpuapr2022.html'
    label: support@hackerone.com
  - url: 'https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://curl.haxx.se/docs/CVE-2020-8231.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://hackerone.com/reports/948876'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202012-14'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2021/dsa-4881'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.oracle.com/security-alerts/cpuapr2022.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-389290.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.03766
epssPercentile: 0.89688
ingestedAt: '2026-10-14T09:24:26.057Z'
---

## Overview

Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending data.

## Affected

- `libcurl >= 7.29.0, <= 7.71.1`
- `sinec_infrastructure_network_services < 1.0.1.1`
- `debian_linux = 10.0`
- `communications_cloud_native_core_policy = 1.14.0`
- `universal_forwarder >= 8.2.0, < 8.2.12`
- `universal_forwarder >= 9.0.0, < 9.0.6`
- `universal_forwarder = 9.1.0`

## Remediation

Upgrade past the affected range:

- `sinec_infrastructure_network_services 1.0.1.1`
- `universal_forwarder 9.0.6`