Is CVE-2017-7758 in the CISA KEV catalog?

No. CVE-2017-7758 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-7758?

CVE-2017-7758 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2017-7758?

CVE-2017-7758 has an EPSS score of 3.15% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-7758?

Upgrade firefox on debian unstable to 54.0-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2017-7758

CRITICALEPSS 86th pctl

9.1

CVSS v3

NVD

Description

An out-of-bounds read vulnerability with the Opus encoder when the number of channels in an audio stream changes while the encoder is in use. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

firefoxDebian

Fixed in:54.0-1CVE-2017-7758

firefoxUbuntu

Fixed in:54.0+build3-0ubuntu0.14.04.1USN-3315-1

Fixed in:54.0+build3-0ubuntu0.16.04.1USN-3315-1

thunderbirdUbuntu

Fixed in:1:52.2.1+build1-0ubuntu0.14.04.1USN-3321-1

Fixed in:1:52.2.1+build1-0ubuntu0.16.04.1USN-3321-1

DeveloperEditionWindows application

Affected:54.0Fixed in:54.0Mozilla

Affected:52.2.0Fixed in:52.2.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:54.0Fixed in:54.0Mozilla

Affected:52.2.0Fixed in:52.2.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:52.2.0Fixed in:52.2.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Exploit Intelligence

3.15%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch1

bugzilla.mozilla.org

Vendor Advisory3

Third-Party Advisory6

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-25.