CVE-2017-5753: Intel CPUs speculative execution side-channel information disclosure (Spectre v1)

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 18 September 2026. Confidence: high.

high priorityThe flaw is a well-known, widely exploited class of CPU side channel with public proof-of-concept code and very high EPSS, though it requires local access and is not in KEV.

What it is

CVE-2017-5753 is a speculative execution and branch prediction side-channel flaw in Intel microprocessors that can leak information through observable timing discrepancies. It is the variant commonly known as Spectre v1 and affects a broad range of Intel CPU families listed in the record. Because the leak is a side channel rather than a memory corruption bug, it is hard to detect and can expose sensitive data held in process memory.

Impact

An attacker with local user access can read information they are not authorized to access by measuring side-channel timing differences. The CVSS vector rates confidentiality impact as High with no integrity or availability impact.

Attack surface

The vector is local (AV:L), requires low privileges (PR:L), and needs no user interaction (UI:N). The attack is reached by running code on the same system as the target data, not over the network.

Exploitation

CISA KEV does not list this CVE, but EPSS is very high (0.93838, 99.839th percentile) and references include an Exploit-tagged proof-of-concept. Public exploit code and extensive research exist, so exploitation is practical for a local attacker.

What to do

• Apply CPU microcode and operating system, hypervisor, and browser updates that include Spectre v1 mitigations.
• Enable compiler-based mitigations such as index masking, lfence insertion, or retpoline where supported by the toolchain.
• Reduce local attack surface by limiting untrusted code execution and restricting interactive or low-privilege access on sensitive hosts.
• For virtualized and cloud environments, ensure host and guest patches are applied and consider disabling same-host untrusted co-tenancy where feasible.
• Track vendor advisories (Intel, Red Hat, Oracle, Xen, AWS, Mozilla, NVIDIA, Aruba, Siemens) for product-specific fixes.

Detection

• Monitor for execution of known Spectre proof-of-concept binaries or unusual high-resolution timing code on sensitive hosts.
• Watch for unexpected local privilege use or processes attempting to read memory outside their expected scope.
• Use host-based telemetry to flag anomalous cache-timing or side-channel probing behavior where such sensors exist.
• Verify patch and microcode levels across endpoints, servers, and hypervisors to confirm mitigations are actually in place.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.