CVE-2007-1558

Severity: low (CVSS 2.6 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2007-04-16 · updated 2026-06-16

Description

The APOP protocol allows remote attackers to guess the first 3 characters of a password via man-in-the-middle (MITM) attacks that use crafted message IDs and MD5 collisions. NOTE: this design-level issue potentially affects all products that use APOP, including (1) Thunderbird 1.x before 1.5.0.12 and 2.x before 2.0.0.4, (2) Evolution, (3) mutt, (4) fetchmail before 6.3.8, (5) SeaMonkey 1.0.x before 1.0.9 and 1.1.x before 1.1.2, (6) Balsa 2.3.16 and earlier, (7) Mailfilter before 0.8.2, and possibly other products.

Affected products

Apop Protocol: all versions

References

http://balsa.gnome.org/download.html
http://docs.info.apple.com/article.html?artnum=305530
http://fetchmail.berlios.de/fetchmail-SA-2007-01.txt
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c00771742
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c00774579
http://lists.apple.com/archives/security-announce/2007/May/msg00004.html
http://mail.gnome.org/archives/balsa-list/2007-July/msg00000.html
http://secunia.com/advisories/25353
http://secunia.com/advisories/25402
http://secunia.com/advisories/25476
http://secunia.com/advisories/25496

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