CVE-2020-26572

Name: CVE-2020-26572
Creator: NVD / NIST
Published: 2020-10-06T02:15:13.13+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.39%

Last modified Jun 17, 2026

CVE-2020-26572 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. The TCOS smart card software driver in OpenSC before 0.21.0-rc1 has a stack-based buffer overflow in tcos_decipher.. EPSS estimates a 0.39% chance of exploitation in the next 30 days.

Description

The TCOS smart card software driver in OpenSC before 0.21.0-rc1 has a stack-based buffer overflow in tcos_decipher.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.39%

31.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Opensc Project	Opensc	<= 0.20.0
Fedoraproject	Fedora	33
Debian	Debian Linux	9.0

References

http://www.openwall.com/lists/oss-security/2020/11/24/4Mailing List, Third Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22967Third Party Advisory
https://github.com/OpenSC/OpenSC/commit/9d294de90d1cc66956389856e60b6944b27b4817Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00027.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXOHFDMNMO6IDECAGUTB3SJGAGXVRT6S/
http://www.openwall.com/lists/oss-security/2020/11/24/4Mailing List, Third Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22967Third Party Advisory
https://github.com/OpenSC/OpenSC/commit/9d294de90d1cc66956389856e60b6944b27b4817Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00027.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXOHFDMNMO6IDECAGUTB3SJGAGXVRT6S/

Timeline

Published: Oct 6, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26572?

The TCOS smart card software driver in OpenSC before 0.21.0-rc1 has a stack-based buffer overflow in tcos_decipher.

How severe is CVE-2020-26572?

CVE-2020-26572 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26572?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26572?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST