Oracle Instantis EnterpriseTrack 17.1/17.2/17.3 Apache HTTP Server out-of-bounds write

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.6$5k-$25k0.00

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Oracle Instantis EnterpriseTrack 17.1/17.2/17.3. Affected by this vulnerability is an unknown functionality of the component Apache HTTP Server. The manipulation leads to an unknown weakness. This vulnerability is referenced as CVE-2021-26691. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Oracle Instantis EnterpriseTrack 17.1/17.2/17.3. This issue affects an unknown functionality of the component Apache HTTP Server. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability.

The weakness was published 10/19/2021 as Oracle Critical Patch Update Advisory - October 2021. The advisory is shared at oracle.com. The identification of this vulnerability is CVE-2021-26691. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 01/21/2026).

We expect the 0-day to have been worth approximately $100k and more. The vulnerability scanner Nessus provides a plugin with the ID 294771 (MiracleLinux 8 : httpd:2.4 (AXSA:2021-2541:01)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (294771). 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: 9.8
VulDB Meta Temp Score: 9.6

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 294771
Nessus Name: MiracleLinux 8 : httpd:2.4 (AXSA:2021-2541:01)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

02/04/2021 🔍
10/19/2021 +256 days 🔍
10/19/2021 +0 days 🔍
10/20/2021 +1 days 🔍
01/21/2026 +1554 days 🔍

Sourcesinfo

Vendor: oracle.com

Advisory: Oracle Critical Patch Update Advisory - October 2021
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-26691 (🔍)
GCVE (CVE): GCVE-0-2021-26691
GCVE (VulDB): GCVE-100-184745

Entryinfo

Created: 10/20/2021 08:09
Updated: 01/21/2026 11:20
Changes: 10/20/2021 08:09 (38), 10/24/2021 09:43 (3), 10/24/2021 09:48 (18), 01/21/2026 11:20 (16)
Complete: 🔍
Cache ID: 216::103

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

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