CVE-2016-9079 is a high-severity use-after-free vulnerability found in the SVG Animation implementation of Mozilla products, including Firefox, Firefox ESR, and Thunderbird. With a CVSS score of 7.5, this vulnerability poses a significant risk to users, especially those on Windows operating systems. An exploit has been discovered in the wild, targeting Firefox and Tor Browser users, highlighting the urgency for organizations to address this issue promptly.
The vulnerability allows attackers to execute arbitrary code by leveraging the use-after-free condition, potentially leading to unauthorized access and data manipulation. The urgency for defenders is underscored by the fact that affected versions include Firefox versions prior to 50.0.2, Firefox ESR versions before 45.5.1, and Thunderbird versions below 45.5.1. Organizations must take immediate action to ensure their systems are protected.
Given the critical nature of this exploit and its presence in the wild, it is paramount for organizations to prioritize patching efforts. The vendor has provided necessary updates to remediate this vulnerability, and organizations should apply these updates as soon as possible to mitigate potential risks.
Organizations not only need to patch but also must evaluate their security posture in light of this vulnerability. Continuous monitoring and timely updates are essential to protect against similar vulnerabilities in the future.
Vulnerability Details
The vulnerability is classified as a use-after-free, specifically identified under CWE-416. Its CVSS score of 7.5 indicates a high severity, with a confidentiality impact classified as high, while integrity and availability impacts are minimal. This highlights the potential for sensitive data exposure without requiring any user interaction, making it particularly dangerous.
Officially published on June 11, 2018, the vulnerability affects a range of products from Mozilla, including Firefox, Firefox ESR, and Thunderbird. As of the last modification date in November 2025, it remains pertinent for affected organizations to stay vigilant.
Technical Analysis
The root cause of this vulnerability stems from improper management of memory, leading to a situation where freed memory can be accessed again. Attackers may leverage this condition to execute arbitrary code on the affected systems. The attack vector is through network exploitation, and the complexity is categorized as low, meaning that the vulnerability can be exploited easily under typical conditions.
The attack requires no privileges and does not necessitate user interaction, increasing the risk of exploitation. The confidentiality impact is significant as it can lead to the exposure of sensitive information, while integrity and availability impacts are noted as none.
Risk & Impact Analysis
Risk to organizations includes potential data breaches and unauthorized access to sensitive information. The vulnerability's presence in widely used software like Firefox and Thunderbird broadens the blast radius, affecting a significant number of users. Given the high CVSS score and the fact that this vulnerability has been added to the Known Exploited Vulnerabilities (KEV) catalog, organizations should prioritize remediation in their patching cycles.
Organizations should assess their risk management strategies regarding this vulnerability and consider the potential impact on their operations. The urgency is underscored by the high exploitability score, indicating that it is a prime target for attackers.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The vulnerability impacts the following products and their respective versions: Firefox < 50.0.2, Firefox ESR < 45.5.1, and Thunderbird < 45.5.1. Organizations using Debian or Red Hat Enterprise Linux distributions are also at risk, with specific versions of these systems confirmed as vulnerable.
Mitigation & Remediation
To mitigate the risks associated with CVE-2016-9079, organizations must update their affected products immediately. Users should upgrade to the latest versions of Firefox, Firefox ESR, and Thunderbird as provided by Mozilla. For additional security, organizations should consider implementing continuous security testing to validate that their systems are not vulnerable to similar issues.
Organizations may also enhance their security posture through configuration hardening and implementing appropriate network controls to restrict access to potential attack vectors.
Detection Guidance
Monitoring systems for unusual behavior, particularly around SVG animations and memory management, can provide early detection of exploitation attempts. Organizations should also review logs for any suspicious activity that correlates with this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2016-9079 lies in its demonstration of how memory management flaws can lead to severe vulnerabilities in widely used applications. This case highlights the need for security teams to focus on robust memory handling practices and ongoing education on the importance of timely patch management.
As trends in exploitation continue to evolve, security teams should take this incident as a learning opportunity, emphasizing the need for comprehensive vulnerability management programs. Organizations can benefit from leveraging insights from this incident to strengthen their defenses against similar threats.
Continuous security testing serves as a vital strategy in identifying and addressing vulnerabilities proactively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)