Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2017-7758

25
FAUCET Score

CVE-2017-7758 is an out-of-bounds read vulnerability in the Opus audio encoder affecting Firefox versions prior to 54, Firefox ESR prior to 52.2, and Thunderbird prior to 52.2. This critical vulnerability, with a CVSS score of 9.1, allows an unauthenticated attacker to achieve high confidentiality and availability impact over a network with low attack complexity. While no public exploit code or active exploitation has been observed, and it is not listed on the KEV catalog, the vulnerability has received limited community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
7.3CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.15%
Probability of exploitation in next 30 days
EPSS Percentile
86.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0315 is in the 78th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

mozillapatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:52.2.0-1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:52.2.0-1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:52.2.0-1.el7_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: thunderbird-0:52.2.0-1.el7_3
View patch

Vendor Advisories (1)

redhatCVE-2017-7758Moderate

Mozilla: Out-of-bounds read in Opus encoder (MFSA 2017-16)

Jun 14, 2017

References

access.redhat.com / errata/RHSA-2017:1440
Third Party Advisory
access.redhat.com / errata/RHSA-2017:1561
Third Party Advisory
bugzilla.mozilla.org / show_bug.cgi
ExploitIssue TrackingPatch
debian.org / security/2017/dsa-3881
Third Party Advisory
debian.org / security/2017/dsa-3918
Third Party Advisory
mozilla.org / security/advisories/mfsa2017-15
Vendor Advisory
mozilla.org / security/advisories/mfsa2017-16
Vendor Advisory
mozilla.org / security/advisories/mfsa2017-17
Vendor Advisory
securityfocus.com / bid/99057
Third Party AdvisoryVDB Entry
securitytracker.com / id/1038689
Third Party AdvisoryVDB Entry