{"cve":"CVE-2007-1558","nvd":{"published":"2007-04-16T22:19:00.000","modified":"2026-06-16T22:37:49.750","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"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"],"products":["apop_protocol:apop_protocol"],"source":"nvd","synced_at":"2026-10-19T19:46:28.846926071+00:00"},"epss":{"cve":"CVE-2007-1558","score":0.02423,"percentile":0.84193,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}