CVE-2021-33833

Name: CVE-2021-33833
Creator: NVD / NIST
Published: 2021-06-09T18:15:08.797+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.86%

Last modified Jun 17, 2026

CVE-2021-33833 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. ConnMan (aka Connection Manager) 1.30 through 1.39 has a stack-based buffer overflow in uncompress in dnsproxy.c via NAME, RDATA, or RDLENGTH (for A or AAAA).. EPSS estimates a 2.86% chance of exploitation in the next 30 days.

Description

ConnMan (aka Connection Manager) 1.30 through 1.39 has a stack-based buffer overflow in uncompress in dnsproxy.c via NAME, RDATA, or RDLENGTH (for A or AAAA).

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.86%

85.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Intel	Connection Manager	>= 1.30, <= 1.39
Debian	Debian Linux	9.0

References

http://www.openwall.com/lists/oss-security/2021/06/09/1Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/01/25/1Exploit, Mailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/02/msg00009.htmlMailing List, Third Party Advisory
https://lore.kernel.org/connman/Vendor Advisory
https://security.gentoo.org/glsa/202107-29Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/06/09/1Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/01/25/1Exploit, Mailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/02/msg00009.htmlMailing List, Third Party Advisory
https://lore.kernel.org/connman/Vendor Advisory
https://security.gentoo.org/glsa/202107-29Third Party Advisory

Timeline

Published: Jun 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33833?

ConnMan (aka Connection Manager) 1.30 through 1.39 has a stack-based buffer overflow in uncompress in dnsproxy.c via NAME, RDATA, or RDLENGTH (for A or AAAA).

How severe is CVE-2021-33833?

CVE-2021-33833 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.86% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33833?

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-2021-33833?

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

Scan your code now

Source: NVD / NIST