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FBI Warns of Russian Hackers Exploiting 7-Year-Old Cisco Flaw



The Federal Bureau of Investigation (FBI) has warned that hackers linked to Russia's Federal Security Service (FSB) are targeting critical infrastructure organizations in attacks exploiting a 7-year-old vulnerability in Cisco devices. The hacking group, known as Berserk Bear and also tracked as Blue Kraken, Crouching Yeti, Dragonfly, and Koala Team, has been aggressively exploiting this vulnerability to compromise unpatched devices belonging to organizations across North America, Asia, Africa, and Europe.

  • The Federal Bureau of Investigation (FBI) has issued a warning about a significant cybersecurity threat from a state-backed hacking group linked to Russia's Federal Security Service (FSB).
  • The hacking group, known as Berserk Bear and others, is exploiting a 7-year-old vulnerability in Cisco devices that allows them to remotely trigger a reload or execute arbitrary code.
  • The vulnerability, CVE-2018-0171, affects the Smart Install feature of Cisco IOS and Cisco IOS XE software, potentially resulting in a denial-of-service (DoS) condition or enabling attackers to gain persistence on compromised devices.
  • The FBI has detected instances of this hacking group targeting US state, local, territorial, and tribal (SLTT) government organizations and aviation entities in recent months.
  • Cisco has updated its advisory on the CVE-2018-0171 flaw and is urging administrators to secure their devices against ongoing attacks as soon as possible.
  • Organizations worldwide are advised to patch vulnerabilities, implement robust security controls, and monitor their networks for signs of suspicious activity to prevent similar network device compromise campaigns.


  • The Federal Bureau of Investigation (FBI) has issued a public service announcement warning of a significant cybersecurity threat that has been unfolding over the past year. The agency has identified a state-backed hacking group, linked to Russia's Federal Security Service (FSB), as being responsible for targeting critical infrastructure organizations worldwide using a 7-year-old vulnerability in Cisco devices.

    The vulnerability in question, CVE-2018-0171, is a critical flaw in the Smart Install feature of Cisco IOS and Cisco IOS XE software. This flaw allows unauthenticated threat actors to remotely trigger a reload of unpatched devices, potentially resulting in a denial-of-service (DoS) condition or enabling the attackers to execute arbitrary code on the targeted device.

    According to the FBI, the hacking group in question, known as Berserk Bear and also tracked as Blue Kraken, Crouching Yeti, Dragonfly, and Koala Team, has been aggressively exploiting this vulnerability in order to compromise unpatched devices belonging to organizations across North America, Asia, Africa, and Europe. These devices have included those from the telecommunications, higher education, and manufacturing sectors.

    The attackers were observed using custom SNMP tooling that enables them to gain persistence on compromised devices and evade detection for years. Additionally, they employed the SYNful Knock firmware implant, first spotted in 2015 by FireEye, which further enhances their ability to remain undetected.

    The FBI's warning comes as no surprise, given the long history of Russian state-sponsored hacking groups targeting critical infrastructure organizations worldwide. Over the past decade, these groups have demonstrated a willingness to engage in sophisticated and targeted attacks against unsuspecting targets.

    In recent months, the FBI has detected instances of the same hacking group targeting US state, local, territorial, and tribal (SLTT) government organizations and aviation entities. The agency's warning serves as a stark reminder that these types of threats are ongoing and will continue to pose a significant risk to organizations worldwide unless adequate measures are taken to patch vulnerabilities and implement robust security controls.

    Cisco has taken steps to address this vulnerability by updating its advisory on the CVE-2018-0171 flaw. The company is urging administrators to secure their devices against ongoing attacks as soon as possible, emphasizing that comprehensive patching and security hardening are critical for all organizations in order to prevent similar network device compromise campaigns.

    The implications of this warning cannot be overstated. As other state-sponsored actors continue to abuse devices which remain unpatched and have Smart Install enabled, the risk of serious disruptions to critical infrastructure increases. It is imperative that organizations worldwide take immediate action to patch vulnerabilities, implement robust security controls, and monitor their networks for signs of suspicious activity.

    In conclusion, the FBI's warning serves as a stark reminder of the ongoing threat landscape facing organizations worldwide. As the cyber threat environment continues to evolve, it is essential that we remain vigilant and proactive in addressing these threats before they can cause significant harm.

    Related Information:
  • https://www.ethicalhackingnews.com/articles/FBI-Warns-of-Russian-Hackers-Exploiting-7-Year-Old-Cisco-Flaw-ehn.shtml

  • Published: Thu Aug 21 07:51:37 2025 by llama3.2 3B Q4_K_M













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