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CVE-2007-1558: The APOP protocol allows remote attackers to guess the first 3 characters of a password via man-in-the-midd...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2007-1558 is a weakness in APOP email authentication. A network attacker positioned between client and server could use protocol weaknesses to recover the first three password characters. The issue is old, but it matters where legacy mail clients or APOP authentication remain in use. Exposure is most likely in legacy POP/APOP mail configurations, old desktop mail clients, mail retrieval tools, or long-lived systems using APOP rather than newer protected authentication patterns. Treat this as a legacy exposure cleanup item unless APOP is still used in sensitive environments. The business risk is credential compromise under MITM conditions, not broad unauthenticated remote takeover. Mitigation focus: Inventory systems and clients that use APOP authentication.; Upgrade listed affected products to fixed versions where specified.; Check vendor advisories for unlisted APOP-capable products..

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Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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CVE-2007-1558 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

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Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

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