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American Focus > Blog > Tech and Science > Cisco Warns: Fine-tuning turns LLMs into threat vectors
Tech and Science

Cisco Warns: Fine-tuning turns LLMs into threat vectors

Last updated: April 6, 2025 7:44 am
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Cisco Warns: Fine-tuning turns LLMs into threat vectors
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Weaponized large language models (LLMs) that have been fine-tuned with offensive tradecraft are revolutionizing cyberattacks, prompting CISOs to rethink their strategies. These advanced models are capable of automating reconnaissance, impersonating identities, and bypassing real-time detection, thus enabling large-scale social engineering attacks.

Popular models like FraudGPT, GhostGPT, and DarkGPT are now available for as little as $75 a month and are specifically designed for malicious activities such as phishing, exploit generation, and credit card validation. Cybercriminal groups, as well as nation-states, are capitalizing on the revenue potential of these weaponized LLMs by offering them as platforms, kits, and leasing options. These models are increasingly being packaged and sold in a similar manner to legitimate SaaS applications, complete with dashboards, APIs, regular updates, and even customer support.

The rise of weaponized LLMs has blurred the lines between legitimate models and malicious tools, putting legitimate LLMs at risk of being compromised and incorporated into cybercriminal toolchains. Fine-tuning an LLM increases the likelihood of it generating harmful outputs, making it susceptible to attacks such as jailbreaks, prompt injections, and model inversion. Without robust security measures in place, fine-tuned models can quickly become liabilities for organizations, providing attackers with an opportunity to infiltrate and exploit them.

Research conducted by Cisco’s security team has shown that fine-tuning LLMs can compromise their alignment, particularly in industries like healthcare and finance where compliance and safety are paramount. Jailbreak attempts against fine-tuned models have been successful at much higher rates compared to base models, highlighting the increased attack surface that comes with fine-tuning.

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Malicious LLMs are now available on the black market for as little as $75 a month, providing cybercriminals with plug-and-play tools for various malicious activities. These models lack the built-in safety features of mainstream LLMs and offer APIs, updates, and dashboards that resemble legitimate SaaS products.

Additionally, the ease with which attackers can poison open-source training datasets for AI models poses a significant threat to AI supply chains. By injecting malicious data into widely used training sets, adversaries can influence the outputs of LLMs in impactful ways, leading to potential security breaches and vulnerabilities.

Furthermore, decomposition attacks can quietly extract copyrighted and regulated content from LLMs without triggering any guardrails. This poses a significant challenge for enterprises, especially those in regulated sectors like healthcare and finance, as it introduces a new compliance risk that extends beyond traditional regulations.

In conclusion, the evolving landscape of weaponized LLMs underscores the need for enhanced security measures and real-time visibility across IT infrastructures. Security leaders must recognize that LLMs are not just tools but represent the latest attack surface that requires proactive defense strategies to mitigate risks effectively.

TAGGED:CiscoFinetuningLLMsThreatTurnsvectorsWarns
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