IBM AIX up to 4.2.1 writesrv Command memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.9$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in IBM AIX up to 4.2.1. The affected element is an unknown function of the component writesrv Command. The manipulation leads to memory corruption. This vulnerability is traded as CVE-1999-0091. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in IBM AIX up to 4.2.1 (Operating System) and classified as critical. This issue affects some unknown functionality of the component writesrv Command. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

buffer overflow in aix writesrv command allows local users to obtain root access.

The issue has been introduced in 08/12/1994. The weakness was shared 10/28/1997. The identification of this vulnerability is CVE-1999-0091. The exploitation is known to be easy. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 1173 days. During that time the estimated underground price was around $5k-$25k.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (2295), SecurityFocus (BID 399†) and Vulnerability Center (SBV-587†). The entries VDB-14012, VDB-14011, VDB-14010 and VDB-14008 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.3
VulDB Meta Temp Score: 8.9

VulDB Base Score: 9.3
VulDB Temp Score: 8.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/12/1994 🔍
10/28/1997 +1173 days 🔍
10/28/1997 +0 days 🔍
10/28/1997 +0 days 🔍
10/28/1997 +0 days 🔍
12/30/2002 +1889 days 🔍
06/18/2014 +4188 days 🔍
04/17/2026 +4321 days 🔍

Sourcesinfo

Vendor: ibm.com

Status: Confirmed

CVE: CVE-1999-0091 (🔍)
GCVE (CVE): GCVE-0-1999-0091
GCVE (VulDB): GCVE-100-14009
X-Force: 2295
SecurityFocus: 399 - AIX writesrv Buffer Overflow Vulnerability
Vulnerability Center: 587 - Buffer Overflow in AIX writesrv Command Allows Local Root Access, Medium

See also: 🔍

Entryinfo

Created: 06/18/2014 16:45
Updated: 04/17/2026 03:22
Changes: 06/18/2014 16:45 (59), 05/07/2019 16:12 (2), 04/17/2026 03:22 (18)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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