AI Safety Filters in Large Language Models Fail During Extended Conversations
Researchers have identified that safety filters in large language models (LLMs) can be bypassed during extended, multi-turn conversations, significantly increasing the risk of adversarial prompt success. Cisco's research demonstrated that attack success rates jump from an average of 13% for single prompts to 64% in longer chats, with some models like Meta's Llama 3.3-70B-Instruct and Alibaba’s Qwen3-32B reaching nearly 93% failure rates. These vulnerabilities are attributed to the models' architectural design, which processes dialogue through sliding context windows and does not consistently reapply safety judgments across conversation turns.
The most capable and open models are the most susceptible to these failures, while more conservatively aligned models such as Google's Gemma 3-1B-IT show smaller gaps between single- and multi-turn failures. Attackers can exploit these weaknesses by gradually shifting the context or rephrasing requests, eventually eliciting responses that bypass initial safety mechanisms and may include the generation of malicious code. The findings highlight a critical challenge in evaluating and securing LLMs, as traditional one-shot prompt testing fails to capture these multi-turn vulnerabilities.
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