pc
nid 94359
Aug 03, 2026
rghosh@vixio.com
US Track 3
FINRA -Guidance
financial services
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2010 charsFinancial Industry Regulatory Authority Issues Cybersecurity Alert on Critical Exim Mail Vulnerabilities
On November 22, 2025, the Financial Industry Regulatory Authority (FINRA) issued a cybersecurity alert warning member firms of two critical vulnerabilities in Exim Mail software that could allow unauthorized system access and data compromise. The National Institute of Standards and Technology (NIST) disclosed the vulnerabilities—identified as CVE-2025-26794 (SQL injection) and CVE-2025-67896 (heap-based buffer overflow)—affecting Exim Mail, free, open-source email server software used on Unix and Linux systems.
The vulnerabilities, when exploited in combination, allow threat actors to corrupt system memory and gain remote control of mail servers. Attackers can embed fraudulent database records with inflated file sizes, causing Exim to write excessive data beyond allocated memory space, potentially crashing systems and enabling remote code execution. CVE-2025-26794 carries a Common Vulnerability Scoring System (CVSS) score of 9.8 with a 72 percent Exploit Prediction Scoring System (EPSS) probability of exploitation within 30 days. CVE-2025-67896 also scores 9.8 on CVSS but shows only 0.1 percent EPSS probability, affecting Exim version 4.99 and earlier releases.
FINRA recommends member firms with Unix or Linux systems immediately identify whether they use Exim Mail and take protective action. Recommended mitigation steps include applying latest security patches and upgrades, establishing robust vulnerability management programs with continuous scanning and asset inventory, implementing network segmentation and access controls, deploying Web Application Firewalls (WAF) or Intrusion Prevention Systems (IPS), hardening system configurations, and implementing security monitoring and alerting. Firms should consult Exim's website for specific patching instructions and test patches in non-production environments first. Member firms identifying data breaches should report incidents to FINRA, the Securities and Exchange Commission (SEC), and the Federal Bureau of Investigation (FBI).
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2058 charsUS Financial Industry Regulatory Authority Issues Cybersecurity Alert on Critical Exim Mail Vulnerabilities
On January 7,2026 the Financial Industry Regulatory Authority (FINRA) issued a cybersecurity alert warning member firms of two critical vulnerabilities in Exim Mail software that could allow unauthorized system access and data compromise.
The National Institute of Standards and Technology (NIST), on November 22, 2025 disclosed the vulnerabilities identified as CVE-2025-26794 (SQL injection) and CVE-2025-67896 (heap-based buffer overflow) affecting Exim Mail, free, open-source email server software used on Unix and Linux systems. The vulnerabilities, when exploited in combination, allow threat actors to corrupt system memory and gain remote control of mail servers.
FINRA warned firms that attackers can embed fraudulent database records with inflated file sizes, causing Exim to write excessive data beyond allocated memory space, potentially crashing systems and enabling remote code execution. CVE-2025-26794 carries a Common Vulnerability Scoring System (CVSS) score of 9.8 with a 72 percent Exploit Prediction Scoring System (EPSS) probability of exploitation within 30 days. CVE-2025-67896 also scores 9.8 on CVSS but shows only 0.1 percent EPSS probability, affecting Exim version 4.99 and earlier releases.
FINRA recommends member firms with Unix or Linux systems immediately identify whether they use Exim Mail and take protective action. Recommended mitigation steps include:
Applying latest security patches and upgrades.
Establishing robust vulnerability management programs with continuous scanning and asset inventory.
Implementing network segmentation and access controls.
Deploying Web Application Firewalls (WAF) or Intrusion Prevention Systems (IPS).
Hardening system configurations.
Implementing security monitoring and alerting.
Firms should consult Exim's website for specific patching instructions and test patches in non-production environments first. Member firms identifying data breaches should report incidents to FINRA, the Securities and Exchange Commission (SEC), and the Federal Bureau of Investigation (FBI).