CVE-2011-1213Lotus Notes Vulnerability
Integer underflow in lzhsr.dll in Autonomy KeyView, as used in IBM Lotus Notes before 8.5.2 FP3, allows remote attackers to execute arbitrary code via a crafted header in a .lzh attachment that triggers a stack-based buffer overflow, aka SPR PRAD88MJ2W.
Published May 31, 2011 · Updated Apr 28, 2026
Key Facts
Patch immediately- CVE-2011-1213 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Lotus Notes (Ibm).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 33% probability of exploitation in the next 30 days.
- Fixed versions are available, including Lotus Notes 8.5.2.2.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v2
9.3
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
33%
Higher than 98.3% of all scored CVEs
Exploit maturity
Weaponized
ATLAS score
57/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Weaponized
Public exploit code
3
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
- advisory44624
Description
Integer underflow in lzhsr.dll in Autonomy KeyView, as used in IBM Lotus Notes before 8.5.2 FP3, allows remote attackers to execute arbitrary code via a crafted header in a .lzh attachment that triggers a stack-based buffer overflow, aka SPR PRAD88MJ2W.
Affected Products
106 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Lotus NotesIbm | 3.0, 3.0.0.1, 3.0.0.2, 4.2, 4.2.1, 4.2.2, 4.5, 4.6 | 8.5.2.2 |
Patched Releases
Lotus Notes
8.5.2.2
Timeline
Publicly disclosed
May 31, 2011
Last updated
Apr 28, 2026
Weakness Type
- CWE-189
References
- advisory44624
- exploitMSF lotusnotes_lzh.rb
- exploitMSF lotusnotes_lzh.rb
- exploitExploitDB-17448
- other20110524 IBM Lotus Notes LZH Attachment Viewer Stack Buffer Overflow
FAQ
Common Questions.
Integer underflow in lzhsr.dll in Autonomy KeyView, as used in IBM Lotus Notes before 8.5.2 FP3, allows remote attackers to execute arbitrary code via a crafted header in a .lzh attachment that triggers a stack-based buffer overflow, aka SPR PRAD88MJ2W.
Affected: Lotus Notes (Ibm) versions 3.0, 3.0.0.1, 3.0.0.2, 4.2, 4.2.1, 4.2.2, 4.5, 4.6. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Lotus Notes 8.5.2.2.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2011-1213 On Your Attack Surface?
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