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01 Record

CVE-2020-29562

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,

MediumPUBLISHEDCNA: mitre
CNA base score4.8 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H

02 Description

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,

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.68% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 76.5% of scored records. A rank, not a probability.
NVD base score
4.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-10-14.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2020-12-04 06:48Z5 YR AGO
Last updated
2026-10-14 09:44Z15 DAYS AGO
Reserved
2020-12-04
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Medium (CVSS 4.8)
CNA CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
Weaknesses
Data version
5.2
Document digest
94d1d6f1eb9ce34ff42afa4f7d986a48b6b75298ccc958255ead9de5112925d6

05 Affected products

VendorProductVersionsPlatforms
fedoraprojectfedoraNot specified—
gnuglibcNot specified—
netappe-series_santricity_os_controllerNot specified—
redhatenterprise_linuxNot specified—

06 References

07 Fixed in

Arch Linux

  • glibc
    Fixed in 2.33-1
  • lib32-glibc
    Fixed in 2.33-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

Debian 12

  • glibc
    Fixed in 2.31-7

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • glibc
    Fixed in 2.31-7

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • glibc
    Fixed in 2.31-7

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • glibc
    Fixed in 2.27-3ubuntu1.5

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • glibc
    Fixed in 2.31-0ubuntu9.7

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.