CVE-2010-4528

directconn.c in the MSN protocol plugin in libpurple 2.7.6 through 2.7.8 in Pidgin before 2.7.9 allows remote authenticated users to cause a denial of service (NULL pointer dereference and application crash) via a short p2pv2 packet in a DirectConnect (aka direct connection) session.

Published: 2011-01-07 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2010-4528 is rated Moderate Risk (44.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.55%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2010-4528

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 2.69% 2.55% -0.14%
2 2025-03-30 4.65% 2.69% -1.96%
3 2025-03-29 — 4.65% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2010-4528

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2010-4528

OS Trackers for CVE-2010-4528

vendor priority summary link
debian medium CVE-2010-4528 medium priority: Debian including 1 source packages (pidgin), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2010-4528
redhat medium — https://access.redhat.com/security/cve/CVE-2010-4528
ubuntu medium CVE-2010-4528 medium priority: Ubuntu including 1 source packages (pidgin), 6 status rows across 6 suites (dapper, hardy, karmic, lucid, maverick, upstream): not-affected 4, DNE 1, released 1. https://ubuntu.com/security/CVE-2010-4528

Affected software / configurations for CVE-2010-4528

Vendor Product Version Raw CPE
pidgin libpurple 2.7.6 cpe:2.3:a:pidgin:libpurple:2.7.6:*:*:*:*:*:*:*
pidgin libpurple 2.7.7 cpe:2.3:a:pidgin:libpurple:2.7.7:*:*:*:*:*:*:*
pidgin libpurple 2.7.8 cpe:2.3:a:pidgin:libpurple:2.7.8:*:*:*:*:*:*:*
pidgin pidgin <= 2.7.8 cpe:2.3:a:pidgin:pidgin:*:*:*:*:*:*:*:*
pidgin pidgin 2.0.0 cpe:2.3:a:pidgin:pidgin:2.0.0:*:*:*:*:*:*:*
pidgin pidgin 2.0.1 cpe:2.3:a:pidgin:pidgin:2.0.1:*:*:*:*:*:*:*
pidgin pidgin 2.0.2 cpe:2.3:a:pidgin:pidgin:2.0.2:*:*:*:*:*:*:*
pidgin pidgin 2.1.0 cpe:2.3:a:pidgin:pidgin:2.1.0:*:*:*:*:*:*:*
pidgin pidgin 2.1.1 cpe:2.3:a:pidgin:pidgin:2.1.1:*:*:*:*:*:*:*
pidgin pidgin 2.2.0 cpe:2.3:a:pidgin:pidgin:2.2.0:*:*:*:*:*:*:*
pidgin pidgin 2.2.1 cpe:2.3:a:pidgin:pidgin:2.2.1:*:*:*:*:*:*:*
pidgin pidgin 2.2.2 cpe:2.3:a:pidgin:pidgin:2.2.2:*:*:*:*:*:*:*
pidgin pidgin 2.3.0 cpe:2.3:a:pidgin:pidgin:2.3.0:*:*:*:*:*:*:*
pidgin pidgin 2.3.1 cpe:2.3:a:pidgin:pidgin:2.3.1:*:*:*:*:*:*:*
pidgin pidgin 2.4.0 cpe:2.3:a:pidgin:pidgin:2.4.0:*:*:*:*:*:*:*
pidgin pidgin 2.4.1 cpe:2.3:a:pidgin:pidgin:2.4.1:*:*:*:*:*:*:*
pidgin pidgin 2.4.2 cpe:2.3:a:pidgin:pidgin:2.4.2:*:*:*:*:*:*:*
pidgin pidgin 2.4.3 cpe:2.3:a:pidgin:pidgin:2.4.3:*:*:*:*:*:*:*
pidgin pidgin 2.5.0 cpe:2.3:a:pidgin:pidgin:2.5.0:*:*:*:*:*:*:*
pidgin pidgin 2.5.1 cpe:2.3:a:pidgin:pidgin:2.5.1:*:*:*:*:*:*:*
pidgin pidgin 2.5.2 cpe:2.3:a:pidgin:pidgin:2.5.2:*:*:*:*:*:*:*
pidgin pidgin 2.5.3 cpe:2.3:a:pidgin:pidgin:2.5.3:*:*:*:*:*:*:*
pidgin pidgin 2.5.4 cpe:2.3:a:pidgin:pidgin:2.5.4:*:*:*:*:*:*:*
pidgin pidgin 2.5.5 cpe:2.3:a:pidgin:pidgin:2.5.5:*:*:*:*:*:*:*
pidgin pidgin 2.5.6 cpe:2.3:a:pidgin:pidgin:2.5.6:*:*:*:*:*:*:*
pidgin pidgin 2.5.7 cpe:2.3:a:pidgin:pidgin:2.5.7:*:*:*:*:*:*:*
pidgin pidgin 2.5.8 cpe:2.3:a:pidgin:pidgin:2.5.8:*:*:*:*:*:*:*
pidgin pidgin 2.5.9 cpe:2.3:a:pidgin:pidgin:2.5.9:*:*:*:*:*:*:*
pidgin pidgin 2.6.0 cpe:2.3:a:pidgin:pidgin:2.6.0:*:*:*:*:*:*:*
pidgin pidgin 2.6.1 cpe:2.3:a:pidgin:pidgin:2.6.1:*:*:*:*:*:*:*
pidgin pidgin 2.6.2 cpe:2.3:a:pidgin:pidgin:2.6.2:*:*:*:*:*:*:*
pidgin pidgin 2.6.4 cpe:2.3:a:pidgin:pidgin:2.6.4:*:*:*:*:*:*:*
pidgin pidgin 2.6.5 cpe:2.3:a:pidgin:pidgin:2.6.5:*:*:*:*:*:*:*
pidgin pidgin 2.6.6 cpe:2.3:a:pidgin:pidgin:2.6.6:*:*:*:*:*:*:*
pidgin pidgin 2.7.0 cpe:2.3:a:pidgin:pidgin:2.7.0:*:*:*:*:*:*:*
pidgin pidgin 2.7.1 cpe:2.3:a:pidgin:pidgin:2.7.1:*:*:*:*:*:*:*
pidgin pidgin 2.7.2 cpe:2.3:a:pidgin:pidgin:2.7.2:*:*:*:*:*:*:*
pidgin pidgin 2.7.3 cpe:2.3:a:pidgin:pidgin:2.7.3:*:*:*:*:*:*:*
pidgin pidgin 2.7.4 cpe:2.3:a:pidgin:pidgin:2.7.4:*:*:*:*:*:*:*
pidgin pidgin 2.7.5 cpe:2.3:a:pidgin:pidgin:2.7.5:*:*:*:*:*:*:*
pidgin pidgin 2.7.6 cpe:2.3:a:pidgin:pidgin:2.7.6:*:*:*:*:*:*:*
pidgin pidgin 2.7.7 cpe:2.3:a:pidgin:pidgin:2.7.7:*:*:*:*:*:*:*

References for CVE-2010-4528

URL Tags
http://developer.pidgin.im/viewmtn/revision/diff/e76f4ad4ef2f10588195a0eedc7a08f82062f79c/with/aaa07bde3c51d3684391ae6ed86b6dbaeab5d031/libpurple/protocols/msn/directconn.c Patch
http://developer.pidgin.im/viewmtn/revision/info/aaa07bde3c51d3684391ae6ed86b6dbaeab5d031 Patch
http://lists.fedoraproject.org/pipermail/package-announce/2011-January/052862.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-January/052905.html
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00003.html
http://pidgin.im/pipermail/support/2010-December/009251.html Patch
http://secunia.com/advisories/42732 Vendor Advisory
http://secunia.com/advisories/42824 Vendor Advisory
http://secunia.com/advisories/42877
http://www.mandriva.com/security/advisories?name=MDVSA-2010:259
http://www.openwall.com/lists/oss-security/2010/12/27/1 Patch
http://www.openwall.com/lists/oss-security/2010/12/31/5 Patch
http://www.pidgin.im/news/security/?id=49 Patch Vendor Advisory
http://www.securityfocus.com/bid/45581
http://www.vupen.com/english/advisories/2011/0028 Vendor Advisory
http://www.vupen.com/english/advisories/2011/0054
http://www.vupen.com/english/advisories/2011/0076
https://bugzilla.redhat.com/show_bug.cgi?id=665421
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18461
cvelogic Threat Intelligence