← Vulnerability feed

Vulnerability record · CVE-2021-3899 · published 3 June 2024

CVE-2021-3899: Canonical apport toctou race condition vulnerability

Canonical · Apport

There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root.

7.8 CVSS 3.1 High EPSS 0.38% · top 69.7% CWE-367 · TOCTOU race condition
7.8CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376 Issue TrackingPatch
https://ubuntu.com/security/notices/USN-5427-1 Vendor Advisory
https://www.cve.org/CVERecord?id=CVE-2021-3899 Third Party Advisory
https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376 Issue TrackingPatch
https://ubuntu.com/security/notices/USN-5427-1 Vendor Advisory
https://www.cve.org/CVERecord?id=CVE-2021-3899 Third Party Advisory

Track CVE-2021-3899 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-11651SaltStack Salt master authentication bypass in ClearFuncsSaltStack Salt before 2019.2.4 and 3000 before 3000.2 fails to properly validate method calls in the salt-master ClearFuncs class, allowing remote un…KEVEPSS 97%analysed9.8CVE-2020-7247OpenSMTPD MAIL FROM command injection allows remote root code executionOpenSMTPD 6.6, as shipped in OpenBSD 6.6 and other products, mishandles input validation in smtp_mailaddr in smtp_session.c, returning an incorrect v…KEVEPSS 99%analysed9.8CVE-2019-11043PHP-FPM buffer overflow enables remote code executionPHP-FPM in certain configurations writes past allocated buffers into FCGI protocol data space, an out-of-bounds write (CWE-787, CWE-120). It affects …KEVEPSS 100%analysed9.8CVE-2019-16928Exim heap buffer overflow in string_vformat via long EHLO commandExim 4.92 through 4.92.2 contains a heap-based buffer overflow in string_vformat in string.c triggered by a long EHLO command, allowing remote code e…KEVEPSS 42%analysed9.8CVE-2019-10149Exim MTA improper recipient validation leads to remote command executionExim versions 4.87 through 4.91 fail to properly validate recipient addresses in the deliver_message() function in /src/deliver.c, allowing command i…KEVEPSS 100%analysed9.8CVE-2018-6789Exim SMTP base64d buffer overflow allows remote code executionExim before 4.90.1 contains a buffer overflow in the base64d function of its SMTP listener. A handcrafted message can trigger the overflow, and the f…KEVEPSS 82%analysed9.8CVE-2016-8735Apache Tomcat JmxRemoteLifecycleListener remote code executionApache Tomcat's JmxRemoteLifecycleListener was not updated to match the Oracle CVE-2016-3427 credential-type fix, leaving a deserialization weakness …KEVEPSS 90%analysed9.8CVE-2016-3427Oracle Java SE JMX Improper Access Control VulnerabilityCVE-2016-3427 is an unspecified vulnerability in Oracle Java SE 6u113, 7u99, 8u77, Java SE Embedded 8u77, and JRockit R28.3.9, reached through vector…KEVEPSS 92%analysed

Source: NIST National Vulnerability Database (record CVE-2021-3899), CISA KEV, FIRST EPSS (scores of 2026-10-08). This page is refreshed as NVD updates the record.