How severe is CVE-2011-4357?

CVE-2011-4357 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2011-4357 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4357?

CVE-2011-4357 primarily affects Brandon Long Clearsilver. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4357?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2011-4357 published?

CVE-2011-4357 was published on 2011-12-10 and last updated on 2026-06-16.

CVE-2011-4357

CVE-2011-4357 is a high-severity vulnerability in Brandon Long Clearsilver with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-134.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-134
Affected product: Brandon Long Clearsilver
Published: 2011-12-10
Last modified: 2026-06-16

Description

Format string vulnerability in the p_cgi_error function in python/neo_cgi.c in the Python CGI Kit (neo_cgi) module for Clearsilver 0.10.5 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via format string specifiers that are not properly handled when creating CGI error messages using the cgi_error API function.

Frequently asked questions

What is CVE-2011-4357?: Format string vulnerability in the p_cgi_error function in python/neo_cgi.c in the Python CGI Kit (neo_cgi) module for Clearsilver 0.10.5 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via format string specifiers that are not properly handled when creating CGI error messages using the cgi_error API function.
How severe is CVE-2011-4357?: CVE-2011-4357 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2011-4357 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4357?: CVE-2011-4357 primarily affects Brandon Long Clearsilver. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4357?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2011-4357 published?: CVE-2011-4357 was published on 2011-12-10 and last updated on 2026-06-16.

References

Affected products (24)

cpe:2.3:a:brandon_long:clearsilver:*:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.1:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.2:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.2.1:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.3:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.4:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.5:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.6:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.7:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.7.1:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.7.2:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.8.0:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.8.1:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.9.0:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.9.1:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.9.2:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.9.3:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.9.6:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.9.7:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.9.14:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.10.1:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.10.2:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.10.3:*:*:*:*:*:*:*
cpe:2.3:a:brandon_long:clearsilver:0.10.4:*:*:*:*:*:*:*

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CVE-2011-0270 — Critical (CVSS 10.0): Format string vulnerability in nnmRptConfig.exe in HP OpenView Network Node Manager (OV NNM) 7.51 and 7.53 allows…

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