CVE-2017-7781

low-risk
Published 2018-06-11

An error occurs in the elliptic curve point addition algorithm that uses mixed Jacobian-affine coordinates where it can yield a result "POINT_AT_INFINITY" when it should not. A man-in-the-middle attacker could use this to interfere with a connection, resulting in an attacked party computing an incorrect shared secret. This vulnerability affects Firefox < 55.

Do I need to act?

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0.91% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.9/10 Medium
NETWORK / HIGH complexity

Affected Products (1)

Affected Vendors

Mozilla

References (8)

Third Party Advisory http://www.securityfocus.com/bid/100383
Third Party Advisory http://www.securitytracker.com/id/1039124
Exploit https://bugzilla.mozilla.org/show_bug.cgi?id=1352039
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-18/
Third Party Advisory http://www.securityfocus.com/bid/100383
Third Party Advisory http://www.securitytracker.com/id/1039124
Exploit https://bugzilla.mozilla.org/show_bug.cgi?id=1352039
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-18/
26
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 3/34 · Minimal
Exposure 5/34 · Minimal