How severe is CVE-2001-1558?

CVE-2001-1558 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2001-1558 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-1558?

CVE-2001-1558 primarily affects Snort. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2001-1558?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2001-1558 published?

CVE-2001-1558 was published on 2001-12-31 and last updated on 2026-06-16.

CVE-2001-1558

CVE-2001-1558 is a medium-severity vulnerability in Snort with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Snort
Published: 2001-12-31
Last modified: 2026-06-16

Description

Unknown vulnerability in IP defragmenter (frag2) in Snort before 1.8.3 allows attackers to cause a denial of service (crash).

Frequently asked questions

What is CVE-2001-1558?: Unknown vulnerability in IP defragmenter (frag2) in Snort before 1.8.3 allows attackers to cause a denial of service (crash).
How severe is CVE-2001-1558?: CVE-2001-1558 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2001-1558 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-1558?: CVE-2001-1558 primarily affects Snort. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2001-1558?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2001-1558 published?: CVE-2001-1558 was published on 2001-12-31 and last updated on 2026-06-16.

References

http://archives.neohapsis.com/archives/snort/2001-11/0990.html

Affected products (3)

cpe:2.3:a:snort:snort:1.8.0:*:*:*:*:*:*:*
cpe:2.3:a:snort:snort:1.8.1:*:*:*:*:*:*:*
cpe:2.3:a:snort:snort:1.8.2:*:*:*:*:*:*:*

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