CVE-2021-20314
Critical
Description
Stack buffer overflow in libspf2 versions below 1.2.11 when processing certain SPF macros can lead to Denial of service and potentially code execution via malicious crafted SPF explanation messages.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Libspf2
PublishedAug 12, 2021
First seenAug 12, 2021
How to fix
Update
- libspf2 libspf21.2.11 or later
Vendor advisories
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMSFT2NJDZ7PATRZSQPAOGSE7JD6ELOB/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GFXJRHPE5OSCPTNA3ZZ4ORDHT4JQH3Y4/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y6T4HYXXSUQCGJB2ES6X7Q74YYF7V7XU/
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| libspf2 libspf2 | v < 1.2.11 | 1.2.11 |
| redhat enterprise_linux | 7.0 | — |
| fedoraproject fedora | 33, 34, 35 | — |
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