How severe is CVE-2017-8307?

CVE-2017-8307 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-8307 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-8307?

CVE-2017-8307 affects Avast Antivirus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-8307?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2017-8307 published?

CVE-2017-8307 was published on 2017-04-27 and last updated on 2026-06-17.

CVE-2017-8307

CVE-2017-8307 is a critical-severity vulnerability in Avast Antivirus with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Avast Antivirus
Published: 2017-04-27
Last modified: 2026-06-17

Description

In Avast Antivirus before v17, using the LPC interface API exposed by the AvastSVC.exe Windows service, it is possible to launch predefined binaries, or replace or delete arbitrary files. This vulnerability is exploitable by any unprivileged user when Avast Self-Defense is disabled. It is also exploitable in conjunction with CVE-2017-8308 when Avast Self-Defense is enabled. The vulnerability allows for Denial of Service attacks and hiding traces of a possible attack.

Frequently asked questions

What is CVE-2017-8307?: In Avast Antivirus before v17, using the LPC interface API exposed by the AvastSVC.exe Windows service, it is possible to launch predefined binaries, or replace or delete arbitrary files. This vulnerability is exploitable by any unprivileged user when Avast Self-Defense is disabled. It is also exploitable in conjunction with CVE-2017-8308 when Avast Self-Defense is enabled. The vulnerability allows for Denial of Service attacks and hiding traces of a possible attack.
How severe is CVE-2017-8307?: CVE-2017-8307 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-8307 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-8307?: CVE-2017-8307 affects Avast Antivirus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-8307?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-8307 published?: CVE-2017-8307 was published on 2017-04-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:avast:antivirus:*:*:*:*:*:*:*:*

More vulnerabilities in Avast Antivirus

CVE-2025-13032 — Critical (CVSS 9.9): Double fetch in sandbox kernel driver in Avast/AVG Antivirus <25.3 on windows allows local attacker to escalate…
CVE-2020-10867 — Critical (CVSS 9.8): An issue was discovered in Avast Antivirus before 20. The aswTask RPC endpoint for the TaskEx library in the Avast…
CVE-2025-3500 — Critical (CVSS 9.0): Integer Overflow or Wraparound vulnerability in Avast Antivirus (25.1.981.6) on Windows allows Privilege…
CVE-2021-45337 — High (CVSS 8.8): Privilege escalation vulnerability in the Self-Defense driver of Avast Antivirus prior to 20.8 allows a local user with…
CVE-2021-45336 — High (CVSS 8.8): Privilege escalation vulnerability in the Sandbox component of Avast Antivirus prior to 20.4 allows a local sandboxed…
CVE-2021-45335 — High (CVSS 8.8): Sandbox component in Avast Antivirus prior to 20.4 has an insecure permission which could be abused by local user to…

All CVEs affecting Avast Antivirus →