Is CVE-2007-1558 in the CISA KEV catalog?

No. CVE-2007-1558 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2007-1558?

CVE-2007-1558 has a CVSS v2 base score of 2.6 (LOW).

What is the EPSS score for CVE-2007-1558?

CVE-2007-1558 has an EPSS score of 2.42% (82th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2007-1558?

Upgrade balsa on debian 11 to 2.3.17-1 or later.

CVE & CISA-KEV Catalog

CVE-2007-1558

LOWEPSS 82th pctl

2.6

CVSS v2

NVD

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.

How to fix

Remediation Available

balsaDebian

Fixed in:2.3.17-1CVE-2007-1558

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.42%probability of exploitation in 30 days

82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.