eMudhra intermediate CA certificates are known for having weak keys, which was flagged by a researcher. This issue led to a significant decline in the company’s stock price. The researcher’s findings were severe enough to cause a 20% drop in the stock value. The exact nature and impact of these weak keys are not specified in the provided evidence, but it is clear that the issue had a substantial effect on the company’s financial performance. The article does not provide further details about the weak keys or their potential consequences. It only mentions the immediate reaction of the stock market to the researcher’s discovery. The focus of the article is on the financial impact of the weak keys rather than the technical details of the issue. The researcher’s findings were enough to cause concern among investors, leading to a significant decline in the company’s stock value.