What’s Vulnerable › Vulnerabilities

CVE-2021-33038

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-26 · updated 2026-06-17
• Weakness: CWE-276

Description

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4. When importing a private mailing list's archives, these archives are publicly visible for the duration of the import. For example, sensitive information might be available on the web for an hour during a large migration from Mailman 2 to Mailman 3.

Affected products

• Debian Linux: 10.0
• Hyperkitty Project Hyperkitty: through 1.3.4

References

• https://gitlab.com/mailman/hyperkitty/-/commit/9025324597d60b2dff740e49b70b15589d6804fa
• https://gitlab.com/mailman/hyperkitty/-/issues/380
• https://techblog.wikimedia.org/2021/06/11/discovering-and-fixing-cve-2021-33038-in-mailman3/
• https://www.debian.org/security/2021/dsa-4922
• https://gitlab.com/mailman/hyperkitty/-/commit/9025324597d60b2dff740e49b70b15589d6804fa
• https://gitlab.com/mailman/hyperkitty/-/issues/380
• https://techblog.wikimedia.org/2021/06/11/discovering-and-fixing-cve-2021-33038-in-mailman3/
• https://www.debian.org/security/2021/dsa-4922

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