---
id: CVE-2020-29562
title: >-
  The iconv function in the GNU C Library (aka glibc or libc6) 2.30 to 2.32,
  when converting UCS4 text containing an irreversible character, fails an
  assertion in the code path and aborts the program, potentially resulting in a
  denial of s…
summary: >-
  The iconv function in the GNU C Library (aka glibc or libc6) 2.30 to 2.32,
  when converting UCS4 text containing an irreversible character, fails an
  assertion in the code path and aborts the program, potentially resulting in a
  denial of s…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-617
  - CWE-617
vendor: gnu
product: glibc
affected:
  - 'glibc >= 2.30, <= 2.32'
  - fedora = 32
  - 'e-series_santricity_os_controller >= 11.0.0, <= 11.60.3'
published: '2020-12-04'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T10:17:34.987'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-29562'
references:
  - url: >-
      https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TVCUNLQ3HXGS4VPUQKWTJGRAW2KTFGXS/
    label: cve@mitre.org
  - url: 'https://security.gentoo.org/glsa/202101-20'
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20210122-0004/'
    label: cve@mitre.org
  - url: 'https://sourceware.org/bugzilla/show_bug.cgi?id=26923'
    label: cve@mitre.org
  - url: >-
      https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TVCUNLQ3HXGS4VPUQKWTJGRAW2KTFGXS/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202101-20'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20210122-0004/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://sourceware.org/bugzilla/show_bug.cgi?id=26923'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-831302.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.01531
epssPercentile: 0.74096
ingestedAt: '2026-10-14T10:25:41.181Z'
---

## Overview

The iconv function in the GNU C Library (aka glibc or libc6) 2.30 to 2.32, when converting UCS4 text containing an irreversible character, fails an assertion in the code path and aborts the program, potentially resulting in a denial of service.

## Affected

- `glibc >= 2.30, <= 2.32`
- `fedora = 32`
- `e-series_santricity_os_controller >= 11.0.0, <= 11.60.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.