Memory corruption in Microsoft Scripting Engine
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-34480 |
| CWE-ID | CWE-119 |
| Exploitation vector | Network |
| Public exploit | Vulnerability #1 is being exploited in the wild. |
| Vulnerable software Subscribe |
Windows Operating systems & Components / Operating system Windows Server Operating systems & Components / Operating system Microsoft Internet Explorer Client/Desktop applications / Web browsers |
| Vendor | Microsoft |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Buffer overflow
EUVDB-ID: #VU55726
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-34480
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to incorrect JIT optimization in jscript9.dll in the Scripting Engine. A remote attacker can trick a victim to open a specially crafted file or visit a malicious website, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsWindows: 7 - 10 S
Windows Server: 2008 R2 - 2019 2004
Microsoft Internet Explorer: 11
External linkshttp://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34480
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
