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CVE-2017-7780

27
FAUCET Score

CVE-2017-7780 describes multiple memory safety bugs in Mozilla Firefox, specifically affecting versions prior to 55. These vulnerabilities could lead to memory corruption, potentially allowing an attacker to execute arbitrary code. Rated with a critical CVSS score of 9.8, this vulnerability has a low attack complexity and does not require user interaction, enabling complete compromise of confidentiality, integrity, and availability. While no public exploit code or active exploitation has been confirmed, the vulnerability has garnered some community discussion and media coverage, indicating awareness within the security community.

Impacted Technologies

VendorProductVersion(s)CPE
< 55.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 55CPE match
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.91%
Probability of exploitation in next 30 days
EPSS Percentile
77.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0191 is in the 66th percentile among its peer group of 36,835 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

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2017-7780Critical

Mozilla: Memory safety bugs fixed in Firefox 55 (MFSA 2017-18)

Aug 8, 2017

References

bugzilla.mozilla.org / buglist.cgi
Issue Tracking
mozilla.org / security/advisories/mfsa2017-18
Vendor Advisory
securityfocus.com / bid/100199
Third Party AdvisoryVDB Entry
securitytracker.com / id/1039124
Third Party AdvisoryVDB Entry