HOMEVULNERABILITIESCVE-2020-9320
MEDIUM

CVE-2020-9320

CWE-434Published: February 20, 2020· Updated: Jun 17, 2026

5.5
CVSS v3.1

Official Description

Avira AV Engine before 8.3.54.138 allows virus-detection bypass via a crafted ISO archive. This affects versions before 8.3.54.138 of Antivirus for Endpoint, Antivirus for Small Business, Exchange Security (Gateway), Internet Security Suite for Windows, Prime, Free Security Suite for Windows, and Cross Platform Anti-malware SDK. NOTE: Vendor asserts that vulnerability does not exist in product

NVD Source

Technical Analysis

CVE-2020-9320 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected Vendors & Products

avira8 product(s)
anti-malware sdkantivirus serveravira antivirus for endpointavira antivirus for small businessavira exchange securityavira free security suiteavira internet security suiteavira prime
Source: NVD CPE · 8 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://packetstormsecurity.com/files/156472/AVIRA-Generic-Malformed-Container-Bypass.html
ADVISORYhttp://seclists.org/fulldisclosure/2020/Feb/31
ADVISORYhttps://blog.zoller.lu/p/from-low-hanging-fruit-department-avira.html
ADVISORYhttp://packetstormsecurity.com/files/156472/AVIRA-Generic-Malformed-Container-Bypass.html
ADVISORYhttp://seclists.org/fulldisclosure/2020/Feb/31
ADVISORYhttps://blog.zoller.lu/p/from-low-hanging-fruit-department-avira.html

All References (8)

→
http://packetstormsecurity.com/files/156472/AVIRA-Generic-Malformed-Container-Bypass.htmlThird Party Advisory · VDB Entry
→
http://seclists.org/fulldisclosure/2020/Feb/31Mailing List · Third Party Advisory
→
https://blog.zoller.lu/p/from-low-hanging-fruit-department-avira.htmlThird Party Advisory
→
https://www.zoller.lu/%5BTZO-01-2020%5D%20AVIRA%20Generic%20Bypass%20ISO.pdf
→
http://packetstormsecurity.com/files/156472/AVIRA-Generic-Malformed-Container-Bypass.htmlThird Party Advisory · VDB Entry
→
http://seclists.org/fulldisclosure/2020/Feb/31Mailing List · Third Party Advisory
→
https://blog.zoller.lu/p/from-low-hanging-fruit-department-avira.htmlThird Party Advisory
→
https://www.zoller.lu/%5BTZO-01-2020%5D%20AVIRA%20Generic%20Bypass%20ISO.pdf

Quick Facts

CVE IDCVE-2020-9320
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-434
CISA KEVNo
Affected1 vendor(s)
PublishedFeb 20, 2020

Related CVEs (CWE-434)

CVE-2025-58963
10.0
CVE-2025-53283
10.0
CVE-2025-9846
10.0
CVE-2025-60219
10.0
CVE-2025-6327
10.0
CVE-2019-7268
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-9320 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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