How severe is CVE-2017-5753?

CVE-2017-5753 has a CVSS score of 5.6/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2017-5753?

Affected package information for CVE-2017-5753 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2017-5753?

No fixed release is recorded for CVE-2017-5753 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

How do I detect CVE-2017-5753 in my code and dependencies?

Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

How do I mitigate CVE-2017-5753 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2017-5753 actively exploited in the wild?

Yes. There are 15 known exploit references for CVE-2017-5753, including 2 documented proof-of-concept exploits on Exploit-DB and 8 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2017-5753?

CVE-2017-5753 has an EPSS (Exploit Prediction Scoring System) score of 93.8%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

When was CVE-2017-5753 published, and has it been updated?

CVE-2017-5753 was published on January 4, 2018 and was last updated on July 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🛡️

Not in CISA KEV

MEDIUM severity

CVE-2017-5753 — Mozilla

MEDIUM

CVE-2017-5753 is a medium-severity (CVSS 5.6) vulnerability. 15 public exploit references exist, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

Published

Jan 4, 2018

Updated

Jul 10, 2026

Affected

—

Patched

—

Exploits

15 known

Exploitation data as of Oct 22, 2026 · OSV.dev, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2017-5753.

EPSS Exploitation Probability

via FIRST.org ↗

93.8%probability of exploitation in next 30 days

Very High Risk0.00%

Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2017-5753 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,415 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Systems with microprocessors utilizing speculative execution and branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-43427localmultiple

Multiple CPUs - 'Spectre' Information Disclosure

by Multiple · Jan 3, 2018

Exploit-DB Source

Detection & mitigation playbook

Vulnerability

Detect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2017-5753 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/speculativeexecution

Product	Fixed in	Advisory
Red Hat Enterprise Linux 5.9 Long Life	`kernel-0:2.6.18-348.35.1.el5`	RHSA-2018:0464
Red Hat Enterprise Linux 5 Extended Lifecycle Support	`kernel-0:2.6.18-426.el5`	RHSA-2018:0292
Red Hat Enterprise Linux 6	`kernel-0:2.6.32-696.23.1.el6`	RHSA-2018:0512
Red Hat Enterprise Linux 6.2 Advanced Update Support	`kernel-0:2.6.32-220.76.2.el6`	RHSA-2018:0020
Red Hat Enterprise Linux 6.4 Advanced Update Support	`kernel-0:2.6.32-358.84.2.el6`	RHSA-2018:0018
Red Hat Enterprise Linux 6.5 Advanced Update Support	`kernel-0:2.6.32-431.85.2.el6`	RHSA-2018:0022
Red Hat Enterprise Linux 6.6 Advanced Update Support	`kernel-0:2.6.32-504.64.4.el6`	RHSA-2018:0017
Red Hat Enterprise Linux 6.7 Extended Update Support	`kernel-0:2.6.32-573.53.1.el6`	RHSA-2018:0496

Frequently Asked Questions

Systems with microprocessors utilizing speculative execution and branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis.

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