CVE-2007-1558
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.
Key facts
- CVSS score
- 2.6 (v2.0)
- Severity
- LOW
- CVSS vector
AV:N/AC:H/Au:N/C:P/I:N/A:N- EPSS score
- 2.4% (84th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2007-1552)
- Published
- April 16, 2007
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2007-1552 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- apop protocol / apop protocol
References
- ftp://patches.sgi.com/support/free/security/advisories/20070602-01-P.asc
- 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(Vendor Advisory)
- http://secunia.com/advisories/25476
- http://secunia.com/advisories/25496(Vendor Advisory)
- http://secunia.com/advisories/25529(Vendor Advisory)
- http://secunia.com/advisories/25534
- http://secunia.com/advisories/25546(Vendor Advisory)
- http://secunia.com/advisories/25559
- http://secunia.com/advisories/25664
- http://secunia.com/advisories/25750
- http://secunia.com/advisories/25798
- http://secunia.com/advisories/25858
- http://secunia.com/advisories/25894
- http://secunia.com/advisories/26083
- http://secunia.com/advisories/26415
- http://secunia.com/advisories/35699
- http://security.gentoo.org/glsa/glsa-200706-06.xml
- http://slackware.com/security/viewer.php?l=slackware-security&y=2007&m=slackware-security.571857
- http://sourceforge.net/forum/forum.php?forum_id=683706
- http://sylpheed.sraoss.jp/en/news.html
- http://www.claws-mail.org/news.php
- http://www.debian.org/security/2007/dsa-1300
- http://www.debian.org/security/2007/dsa-1305(Patch)
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:105
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:107
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:113
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:119
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:131
- http://www.mozilla.org/security/announce/2007/mfsa2007-15.html(Patch, Vendor Advisory)
- http://www.novell.com/linux/security/advisories/2007_14_sr.html
- http://www.novell.com/linux/security/advisories/2007_36_mozilla.html
- http://www.openwall.com/lists/oss-security/2009/08/15/1
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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