AnalysisPublished 24 Apr 2026

Eavesdropping via fiber-optic cables | Kaspersky official blog

Source Kaspersky Security Blog

Description

A side-channel attack that allows a fiber-optic cable to be used as a microphone.

Impact

The impact is limited due to the high complexity and physical access requirements. An attacker with control over the optical distribution network could potentially eavesdrop on vibrations transmitted through fiber-optic cables, but capturing intelligible speech remotely is currently not feasible without additional implanted devices. The attack could enable stealthy surveillance that is difficult to detect with conventional bug-sweeping tools. However, the need for ISP infrastructure access and specialized equipment significantly reduces the likelihood of exploitation.

Defensive guidance

Mitigation primarily involves securing physical access to the optical distribution network and network equipment to prevent attackers from gaining the necessary control. Regular inspections and securing network infrastructure locations can reduce risk. Since the attack is largely theoretical and difficult to execute, no immediate action is required for typical users or organizations.

References

kaspersky.com/blog/fiber-optics-eavesdropping/55658/ (opens in a new tab)

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Description

AI analysisMachine-generated, updated 24 Apr 2026, 20:36 UTC

References

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