Is CVE-2011-4603 in the CISA KEV catalog?

No. CVE-2011-4603 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-4603?

CVE-2011-4603 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2011-4603?

CVE-2011-4603 has an EPSS score of 3.73% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-4603?

Upgrade pidgin on debian 11 to 2.10.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-4603

MEDIUMEPSS 89th pctl

5.0

CVSS v2

NVD

Description

The silc_channel_message function in ops.c in the SILC protocol plugin in libpurple in Pidgin before 2.10.1 does not perform the expected UTF-8 validation on message data, which allows remote attackers to cause a denial of service (application crash) via a crafted message, a different vulnerability than CVE-2011-3594.

CWE-20Improper Input Validation

How to fix

Remediation Available

pidginDebian

Fixed in:2.10.1-1CVE-2011-4603

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

3.73%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Patch2

Other references6

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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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 2026-04-29.