How severe is CVE-2007-2161?

CVE-2007-2161 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2007-2161 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-2161?

CVE-2007-2161 affects Microsoft Internet Explorer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2007-2161?

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

When was CVE-2007-2161 published?

CVE-2007-2161 was published on 2007-04-22 and last updated on 2026-06-16.

CVE-2007-2161

CVE-2007-2161 is a medium-severity vulnerability in Microsoft Internet Explorer with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 12% (96th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Internet Explorer
Published: 2007-04-22
Last modified: 2026-06-16

Description

Microsoft Internet Explorer 7 allows remote attackers to cause a denial of service (browser hang) via JavaScript that matches a regular expression against a long string, as demonstrated using /(.)*/.

Frequently asked questions

What is CVE-2007-2161?: Microsoft Internet Explorer 7 allows remote attackers to cause a denial of service (browser hang) via JavaScript that matches a regular expression against a long string, as demonstrated using /(.)*/.
How severe is CVE-2007-2161?: CVE-2007-2161 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2007-2161 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-2161?: CVE-2007-2161 affects Microsoft Internet Explorer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2007-2161?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2007-2161 published?: CVE-2007-2161 was published on 2007-04-22 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:internet_explorer:7.0:*:*:*:*:*:*:*

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