How severe is CVE-2011-4939?

CVE-2011-4939 has a CVSS 2.0 base score of 6.4, rated medium severity.

Is CVE-2011-4939 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4939?

CVE-2011-4939 primarily affects Pidgin. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4939?

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

When was CVE-2011-4939 published?

CVE-2011-4939 was published on 2012-03-15 and last updated on 2026-06-16.

CVE-2011-4939

CVE-2011-4939 is a medium-severity vulnerability in Pidgin with a CVSS 2.0 base score of 6.4. 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-264.

Key facts

Severity: Medium (CVSS 2.0 base score 6.4)
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Pidgin
Published: 2012-03-15
Last modified: 2026-06-16

Description

The pidgin_conv_chat_rename_user function in gtkconv.c in Pidgin before 2.10.2 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) by changing a nickname while in an XMPP chat room.

Frequently asked questions

What is CVE-2011-4939?: The pidgin_conv_chat_rename_user function in gtkconv.c in Pidgin before 2.10.2 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) by changing a nickname while in an XMPP chat room.
How severe is CVE-2011-4939?: CVE-2011-4939 has a CVSS 2.0 base score of 6.4, rated medium severity.
Is CVE-2011-4939 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4939?: CVE-2011-4939 primarily affects Pidgin. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4939?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4939 published?: CVE-2011-4939 was published on 2012-03-15 and last updated on 2026-06-16.

References

Affected products (46)

cpe:2.3:a:pidgin:pidgin:*:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.0.0:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.0.2:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.1.0:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.2.0:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.2.1:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.2.2:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.3.0:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.3.1:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.4.0:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.4.1:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.4.2:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.4.3:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.5.0:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.5.1:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.5.2:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.5.3:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.5.4:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.5.5:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.5.6:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.5.7:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.5.8:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.5.9:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.0:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.1:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.2:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.3:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.4:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.5:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.6:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.1:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.2:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.3:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.4:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.5:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.6:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.7:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.8:*:*:*:*:*:*:*

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