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CVE-2017-5566

18
FAUCET Score

CVE-2017-5566 describes a code injection vulnerability in AVG Ultimate, Internet Security, and AntiVirus FREE versions 17.1 and earlier. This flaw allows a local attacker to bypass AVG's self-protection mechanism and inject arbitrary code, gaining full control over any AVG process through a "DoubleAgent" attack. With a CVSS score of 6.7 (Medium), this vulnerability requires high privileges but has low attack complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. While there is no known active exploitation or public exploit code, the vulnerability has garnered significant community discussion and media coverage, indicating awareness of its potential impact.

Impacted Technologies

VendorProductVersion(s)CPE
17.1CPE matchmatch criteria
cpe:2.3:a:avg:anti-virus:17.1:*:*:*:free:*:*:*
17.1CPE matchmatch criteria
cpe:2.3:a:avg:internet_security:17.1:*:*:*:*:*:*:*
17.1CPE matchmatch criteria
cpe:2.3:a:avg:ultimate:17.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.7MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.62%
Probability of exploitation in next 30 days
EPSS Percentile
46.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0062 is in the 94th percentile among its peer group of 3,720 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cybellum.com / doubleagent-taking-full-control-antivirus
Third Party Advisory
cybellum.com / doubleagentzero-day-code-injection-and-persistence-technique
Technical DescriptionThird Party Advisory
securityfocus.com / bid/97022
Third Party AdvisoryVDB Entry