CVE-2021-26419 is classified as a scripting engine memory corruption vulnerability affecting Microsoft Internet Explorer. This vulnerability has a CVSS score of 7.5, indicating a high severity level. Organizations utilizing Internet Explorer should be aware of the potential risks associated with this vulnerability, as it allows attackers to exploit the scripting engine, potentially leading to unauthorized access or system compromise. The urgency for defenders is high, as this vulnerability may be leveraged by attackers in the wild.
The vulnerability was published on May 11, 2021, and affects multiple versions of Internet Explorer. With an attack vector classified as 'NETWORK' and requiring user interaction, the complexity of exploitation is deemed high. Organizations are strongly advised to address this vulnerability through timely patching, as failure to do so could expose them to significant risks, including data breaches and system integrity compromise.
Currently, there are no known exploits or public proofs of concept available for CVE-2021-26419. However, the absence of known exploits does not diminish the importance of applying the necessary security updates. Organizations should prioritize patching immediately to ensure their systems remain secure against potential threats.
As this vulnerability is classified as high severity, it is imperative for organizations to take proactive measures to secure their environments. Engaging in thorough vulnerability management practices, including regular assessments and timely application of patches, is crucial in maintaining a robust security posture.
Vulnerability Details
The vulnerability allows for memory corruption within the scripting engine of Internet Explorer. It is classified under CWE-787, which pertains to improper access to memory locations. The CVSS 3.1 vector for this vulnerability is 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H', highlighting the potential impacts on confidentiality, integrity, and availability.
The affected product is Microsoft Internet Explorer, specifically versions 9 and 11. Organizations using these versions are at risk and should ensure they have implemented the necessary patches. The vulnerability was disclosed in May 2021, and ongoing monitoring for any related advisories is recommended.
Technical Analysis
The root cause of CVE-2021-26419 lies within the scripting engine's handling of memory. Specifically, improper management of memory allocations can lead to corruption, which attackers may exploit to execute arbitrary code. The attack vector involves network access, requiring user interaction to trigger the exploit. The complexity of this attack is classified as high, indicating that successful exploitation may require specific conditions to be met.
In terms of impact, the vulnerability poses risks across confidentiality, integrity, and availability. Successful exploitation could lead to unauthorized access, data manipulation, and service disruption. Given that no privileges are required for exploitation, the risk level is significantly increased, making it critical for organizations to address this vulnerability.
Risk & Impact Analysis
The real-world risk posed by CVE-2021-26419 is substantial, especially for organizations still utilizing Internet Explorer for web browsing. Attackers may leverage this vulnerability to gain unauthorized access to sensitive data, execute malicious code, or disrupt services. The blast radius for this vulnerability is concerning, given the widespread use of Internet Explorer in various environments.
Organizations should assess their exposure to this vulnerability and prioritize it in their patch management cycle. The urgency assessment, based on the CVSS score and the potential for exploitation, dictates immediate attention. Organizations should also engage in thorough vulnerability assessments to identify any additional gaps in their security posture.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects Microsoft Internet Explorer versions 9 and 11. Organizations running these versions should ensure they have applied the necessary patches to mitigate the risks associated with CVE-2021-26419. If version information is missing, it is advisable to state: 'All versions prior to vendor patch.'
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the latest security patches provided by Microsoft. The patch addresses the memory corruption issues within Internet Explorer, significantly lowering the risk of exploitation. For organizations that may not be able to apply the patch immediately, it is recommended to implement configuration hardening and network controls to limit exposure.
For ongoing protection, organizations should conduct regular security assessments and evaluations of their Internet Explorer deployments. Engaging in penetration testing can help identify vulnerabilities and ensure that security measures are effective.
Detection Guidance
Organizations should monitor logs for indicators of exploitation attempts, including unusual network activity and access patterns associated with Internet Explorer. Behavioral anomalies, such as unexpected script execution or crashes, may also signify an attempt to exploit this vulnerability.
Additionally, implementing network signatures to detect traffic patterns indicative of exploitation attempts can enhance the organization's defensive posture against CVE-2021-26419.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-26419 lies in the ongoing risks associated with legacy software such as Internet Explorer. As organizations transition to more secure browsers, those remaining on vulnerable platforms may face heightened risks. This vulnerability represents a pattern of memory corruption issues that can be exploited if left unaddressed.
Security teams should take this as a lesson to regularly assess their software inventory and prioritize updates. Continuous monitoring and engagement in penetration testing methodologies will help identify and mitigate risks in real-time as threat landscapes evolve.
Overall, organizations must remain vigilant and proactive in their security efforts. Maintaining an updated security posture and quickly addressing vulnerabilities like CVE-2021-26419 is crucial to safeguarding sensitive data and ensuring business continuity.
Known Exploitation Timeline
As of now, CVE-2021-26419 is not included in the KEV catalog, indicating that it has not been actively exploited in the wild. Organizations should remain aware of potential future threats and monitor for any changes in the status of this vulnerability.
EPSS Risk Context
The EPSS score for CVE-2021-26419 is 0.341, placing it in the 97th percentile. This indicates a high probability of exploitation in the wild, emphasizing the need for immediate remediation efforts by organizations using affected versions of Internet Explorer.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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