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CVE-2021-21371

Execution of untrusted code through config file

5.0 MediumFix available

Tenable for Jira Cloud is an open source project designed to pull Tenable.io vulnerability data, then generate Jira Tasks and sub-tasks based on the vulnerabilities' current state. It published in pypi as "tenable-jira-cloud". In tenable-jira-cloud before version 1.1.21, it is possible to run arbitrary commands through the yaml.load() method. This could allow an attacker with local access to the host to run arbitrary code by running the application with a specially crafted YAML configuration file. This is fixed in version 1.1.21 by using yaml.safe_load() instead of yaml.load().

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.45%Down 0.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 5.0

Execution of untrusted code through config file

Tenable for Jira Cloud is an open source project designed to pull Tenable.io vulnerability data, then generate Jira Tasks and sub-tasks based on the vulnerabilities' current state. It published in pypi as "tenable-jira-cloud". In tenable-jira-cloud before version 1.1.21, it is possible to run arbitrary commands through the yaml.load() method. This could allow an attacker with local access to the host to run arbitrary code by running the application with a specially crafted YAML configuration file. This is fixed in version 1.1.21 by using yaml.safe_load() instead of yaml.load().

Record
CVE-2021-21371
CVSS 3.1
5.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-502
Updated
2026-11-02
EUVDEUVD-2021-0252 5.0

Tenable for Jira Cloud is an open source project designed to pull Tenable.io vulnerability data, then generate Jira Tasks and sub-tasks based on the vulnerabilities' current state. It published in pypi as "tenable-jira-cloud". In tenable-jira-cloud before version 1.1.21, it is possible to run arbitrary commands through the yaml.load() method. This could allow an attacker with local access to the host to run arbitrary code by running the application with a specially crafted YAML configuration file. This is fixed in version 1.1.21 by using yaml.safe_load() instead of yaml.load().

Record
EUVD-2021-0252
CVSS 3.1
5.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-8278-88vv-x98r 4.6

Execution of untrusted code through config file

Impact

It is possible to run arbitrary commands through the yaml.load() method. This could allow an attacker with local access to the host to run arbitrary code by running the application with a specially crafted YAML configuration file.

Workarounds

Manually adjust yaml.load() to yaml.safe_load()

For more information

If you have any questions or comments about this advisory:

Record
GHSA-8278-88vv-x98r
CVSS 4.0
4.6 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
CVSS 3.1
5.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-502
Updated
2026-11-02
NVD 5.0

Tenable for Jira Cloud is an open source project designed to pull Tenable.io vulnerability data, then generate Jira Tasks and sub-tasks based on the vulnerabilities' current state. It published in pypi as "tenable-jira-cloud". In tenable-jira-cloud before version 1.1.21, it is possible to run arbitrary commands through the yaml.load() method. This could allow an attacker with local access to the host to run arbitrary code by running the application with a specially crafted YAML configuration file. This is fixed in version 1.1.21 by using yaml.safe_load() instead of yaml.load().

Record
CVE-2021-21371
CVSS 3.1
5.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 3.1
8.6 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVSS 2.0
4.6 MediumAV:L/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-502
Updated
2026-11-02
OSV 8.6

Tenable for Jira Cloud is an open source project designed to pull Tenable.io vulnerability data, then generate Jira Tasks and sub-tasks based on the vulnerabilities' current state. It published in pypi as "tenable-jira-cloud". In tenable-jira-cloud before version 1.1.21, it is possible to run arbitrary commands through the yaml.load() method. This could allow an attacker with local access to the host to run arbitrary code by running the application with a specially crafted YAML configuration file. This is fixed in version 1.1.21 by using yaml.safe_load() instead of yaml.load().

Record
CVE-2021-21371
CVSS 3.1
8.6 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVGHSA-8278-88vv-x98r 4.6

Execution of untrusted code through config file

Impact

It is possible to run arbitrary commands through the yaml.load() method. This could allow an attacker with local access to the host to run arbitrary code by running the application with a specially crafted YAML configuration file.

Workarounds

Manually adjust yaml.load() to yaml.safe_load()

For more information

If you have any questions or comments about this advisory:

Record
GHSA-8278-88vv-x98r
CVSS 4.0
4.6 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
CVSS 3.1
5.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-502
Updated
2026-11-02
OSVPYSEC-2021-60 No score

Tenable for Jira Cloud is an open source project designed to pull Tenable.io vulnerability data, then generate Jira Tasks and sub-tasks based on the vulnerabilities' current state. It published in pypi as "tenable-jira-cloud". In tenable-jira-cloud before version 1.1.21, it is possible to run arbitrary commands through the yaml.load() method. This could allow an attacker with local access to the host to run arbitrary code by running the application with a specially crafted YAML configuration file. This is fixed in version 1.1.21 by using yaml.safe_load() instead of yaml.load().

Record
PYSEC-2021-60
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
tenable-jira-cloud
PyPI
 before 1.1.21
1.1.21
tenable-jira-cloud
PyPI
 before 1.1.21, plus listed versions
1.0.01.1.01.1.11.1.101.1.11
Show 17 moreShow less
1.1.121.1.131.1.141.1.151.1.161.1.171.1.181.1.191.1.21.1.201.1.31.1.41.1.51.1.61.1.71.1.81.1.9
1.1.21
tenable-jira-cloud
PyPI
 before 1.1.22, plus listed versions
1.0.01.1.01.1.11.1.21.1.3
Show 17 moreShow less
1.1.41.1.51.1.61.1.71.1.81.1.91.1.101.1.111.1.121.1.131.1.141.1.151.1.161.1.171.1.181.1.191.1.20
1.1.22

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-21371 is a medium vulnerability (CVSS 5.0) in Tenable Jira Cloud, published March 10, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. Fixed in tenable-jira-cloud 1.1.21.

References

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