CVE-2021-33038 json
Exposure of sensitive information to an unauthorized actor in HyperKitty
published 2021-05-26 5 y ago modified 2026-06-17 4 mo ago also GHSA-h39g-q63v-4h9p , PYSEC-2021-77 , EUVD-2021-0099
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.8%
- EPSS 1.8% chance of exploitation in 30 days, percentile 79%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi hyperkitty 1.3.5
- hyperkitty Debian 14, Debian 13, Debian 12 1.3.4-4
debian advisories DEBIAN-CVE-2021-33038
- python-HyperKitty openSUSE Leap 15.2 1.3.2-lp152.2.3.1
opensuse advisories openSUSE-SU-2021:0861-1
- hyperkitty Arch Linux 1.3.5-1
arch linux advisories AVG-2003
Exploit prediction
1.85% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- gitlab.com https://gitlab.com/mailman/hyperkitty/-/issues/380 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | hyperkitty | <1.3.5 |
1.3.5 |
Classification
References
-
gitlab.com
/mailman/hyperkitty/-/commit/9025324597d60b2dff740e49b70b15589d6804fa
web, patch, third-party-advisory
-
gitlab.com
/mailman/hyperkitty/-/issues/380
web, exploit, issue-tracking, patch, third-party-advisory
-
techblog.wikimedia.org
/2021/06/11/discovering-and-fixing-cve-2021-33038-in-mailman3/
patch, third-party-advisory
-
debian.org
/security/2021/dsa-4922
vendor-advisory, web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-33038
advisory
-
github.com
/advisories/GHSA-h39g-q63v-4h9p
advisory
-
github.com
/pypa/advisory-database/tree/main/vulns/hyperkitty/PYSEC-2021-77.yaml
web
-
gitlab.com
/mailman/hyperkitty
package
-
gitlab.com
/mailman/hyperkitty/-/blob/master/doc/news.rst#L83-L87
web
-
techblog.wikimedia.org
/2021/06/11/discovering-and-fixing-cve-2021-33038-in-mailman3
web
Sources
- CVE List CVE-2021-33038
- GitHub Advisory GHSA-h39g-q63v-4h9p
- NVD CVE-2021-33038
- OSV PYSEC-2021-77
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.