Vulnerability · Published May 26, 2021 · Assigned by mitre

CVE-2021-33038

High 7.5

In plain English

A high-severity security flaw in the hyperkitty package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.8% (higher than 79% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.5High

Exploit odds (30 days)1.8%top 20.9% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	hyperkitty	1.3.4-4	DEBIAN-CVE-2021-33038
Debian:13	hyperkitty	1.3.4-4	DEBIAN-CVE-2021-33038
Debian:14	hyperkitty	1.3.4-4	DEBIAN-CVE-2021-33038
PyPI	hyperkitty	1.3.5	GHSA-h39g-q63v-4h9p
PyPI	hyperkitty	1.3.5	PYSEC-2021-77
Ubuntu:22.04:LTS	hyperkitty	no fix listed	UBUNTU-CVE-2021-33038
Ubuntu:24.04:LTS	hyperkitty	no fix listed	UBUNTU-CVE-2021-33038
Ubuntu:25.10	hyperkitty	no fix listed	UBUNTU-CVE-2021-33038
Ubuntu:26.04:LTS	hyperkitty	no fix listed	UBUNTU-CVE-2021-33038
Ubuntu:26.10	hyperkitty	no fix listed	UBUNTU-CVE-2021-33038

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

References

https://gitlab.com/mailman/hyperkitty/-/issues/380 x_refsource_CONFIRM
https://gitlab.com/mailman/hyperkitty/-/commit/9025324597d60b2dff740e49b70b15589d6804fa x_refsource_CONFIRM
DSA-4922 vendor-advisory, x_refsource_DEBIAN
https://techblog.wikimedia.org/2021/06/11/discovering-and-fixing-cve-2021-33038-in-mailman3/ x_refsource_MISC