How severe is CVE-2017-8773?

CVE-2017-8773 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-2017-8773 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-8773?

CVE-2017-8773 primarily affects Quickheal Antivirus Pro. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-8773?

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-2017-8773 published?

CVE-2017-8773 was published on 2017-05-04 and last updated on 2026-06-17.

CVE-2017-8773

CVE-2017-8773 is a critical-severity vulnerability in Quickheal Antivirus Pro 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. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Quickheal Antivirus Pro
Published: 2017-05-04
Last modified: 2026-06-17

Description

Quick Heal Internet Security 10.1.0.316, Quick Heal Total Security 10.1.0.316, and Quick Heal AntiVirus Pro 10.1.0.316 are vulnerable to Out of Bounds Write on a Heap Buffer due to improper validation of dwCompressionSize of Microsoft WIM Header WIMHEADER_V1_PACKED. This vulnerability can be exploited to gain Remote Code Execution as well as Privilege Escalation.

Frequently asked questions

What is CVE-2017-8773?: Quick Heal Internet Security 10.1.0.316, Quick Heal Total Security 10.1.0.316, and Quick Heal AntiVirus Pro 10.1.0.316 are vulnerable to Out of Bounds Write on a Heap Buffer due to improper validation of dwCompressionSize of Microsoft WIM Header WIMHEADER_V1_PACKED. This vulnerability can be exploited to gain Remote Code Execution as well as Privilege Escalation.
How severe is CVE-2017-8773?: CVE-2017-8773 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-2017-8773 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-8773?: CVE-2017-8773 primarily affects Quickheal Antivirus Pro. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-8773?: 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-2017-8773 published?: CVE-2017-8773 was published on 2017-05-04 and last updated on 2026-06-17.

References

http://payatu.com/oob-write-heap-buffer-dwcompressionsize-ms-wim/

Affected products (3)

cpe:2.3:a:quickheal:antivirus_pro:*:*:*:*:*:*:*:*
cpe:2.3:a:quickheal:internet_security:*:*:*:*:*:*:*:*
cpe:2.3:a:quickheal:total_security:*:*:*:*:*:*:*:*

More vulnerabilities in Quickheal Antivirus Pro

CVE-2017-8775 — Critical (CVSS 9.8): Quick Heal Internet Security 10.1.0.316, Quick Heal Total Security 10.1.0.316, and Quick Heal AntiVirus Pro 10.1.0.316…
CVE-2017-8774 — Critical (CVSS 9.8): Quick Heal Internet Security 10.1.0.316, Quick Heal Total Security 10.1.0.316, and Quick Heal AntiVirus Pro 10.1.0.316…
CVE-2017-5005 — Critical (CVSS 9.8): Stack-based buffer overflow in Quick Heal Internet Security 10.1.0.316 and earlier, Total Security 10.1.0.316 and…
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CVE-2018-8090 — High (CVSS 7.8): Quick Heal Total Security 64 bit 17.00 (QHTS64.exe), (QHTSFT64.exe) - Version 10.0.1.38; Quick Heal Total Security 32…
CVE-2017-8776 — High (CVSS 7.5): Quick Heal Internet Security 10.1.0.316, Quick Heal Total Security 10.1.0.316, and Quick Heal AntiVirus Pro 10.1.0.316…

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