pango up to 1.28.3 pango/pangoft2-render.c pango_ft2_font_render_box_glyph memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability has been found in pango and classified as very critical. This vulnerability affects the function pango_ft2_font_render_box_glyph of the file pango/pangoft2-render.c. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Heap-based buffer overflow in the pango_ft2_font_render_box_glyph function in pango/pangoft2-render.c in libpango in Pango 1.28.3 and earlier, when the FreeType2 backend is enabled, allows user-assisted remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted font file, related to the glyph box for an FT_Bitmap object.

The weakness was presented 01/22/2011 by Dan Rosenberg as Bug 671122 as confirmed bug report (Bugzilla). The advisory is available at This vulnerability was named CVE-2011-0020 since 12/07/2010. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/13/2021).

It is possible to download the exploit at It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 75599 (openSUSE Security Update : libpango-1_0-0 (openSUSE-SU-2011:0221-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 155515 (Oracle Enterprise Linux Update for Pango (ELSA-2011-0180) (Deprecated)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (64832) and Tenable (75599).




CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.4

VulDB Base Score: 10.0
VulDB Temp Score: 9.4
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Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

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Nessus ID: 75599
Nessus Name: openSUSE Security Update : libpango-1_0-0 (openSUSE-SU-2011:0221-1)
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OpenVAS ID: 880472
OpenVAS Name: CentOS Update for evolution28-pango CESA-2011:0180 centos4 i386
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Threat Intelligenceinfo

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Recommended: no mitigation known
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12/07/2010 🔍
01/18/2011 +42 days 🔍
01/18/2011 +0 days 🔍
01/19/2011 +1 days 🔍
01/22/2011 +2 days 🔍
01/22/2011 +0 days 🔍
01/24/2011 +2 days 🔍
01/27/2011 +3 days 🔍
01/30/2011 +3 days 🔍
06/13/2014 +1230 days 🔍
03/19/2015 +279 days 🔍
10/13/2021 +2400 days 🔍


Advisory: Bug 671122
Researcher: Dan Rosenberg
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2011-0020 (🔍)

X-Force: 64832
SecurityTracker: 1024994 - Pango Heap Overflow in pango_ft2_font_render_box_glyph() Lets Remote Users Execute Arbitrary Code
Vulnerability Center: 29389 - Pango 1.28.3 and Earlier Remote Denial of Service or Arbitrary Code Execution Vulnerability, Medium
SecurityFocus: 45842 - Pango Font Parsing 'pangoft2-render.c' Heap Corruption Vulnerability
Secunia: 42934 - Pango "pango_ft2_font_render_box_glyph()" Buffer Overflow Vulnerability, Moderately Critical
OSVDB: 70596 - Pango pango/pangoft2-render.c pango_ft2_font_render_box_glyph() Function Overflow DoS
Vupen: ADV-2011-0186

scip Labs:


Created: 03/19/2015 11:27 PM
Updated: 10/13/2021 07:24 AM
Changes: 03/19/2015 11:27 PM (68), 08/20/2017 10:06 PM (22), 10/13/2021 07:24 AM (2)
Complete: 🔍


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