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CVE-2005-1935

• Severity: high (CVSS 7.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 26.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2005-06-09 · updated 2026-06-16

Description

Heap-based buffer overflow in the BERDecBitString function in Microsoft ASN.1 library (MSASN1.DLL) allows remote attackers to execute arbitrary code via nested constructed bit strings, which leads to a realloc of a non-null pointer and causes the function to overwrite previously freed memory, as demonstrated using a SPNEGO token with a constructed bit string during HTTP authentication, and a different vulnerability than CVE-2003-0818. NOTE: the researcher has claimed that MS:MS04-007 fixes this issue.

Affected products

• Microsoft Windows 2000: all versions
• Microsoft Windows 2003 Server: 64-bit, r2
• Microsoft Windows Nt: 4.0-sp6, 4.0-sp6a
• Microsoft Windows XP Service Pack 3: all versions

References

• http://www.phreedom.org/solar/exploits/msasn1-bitstring/
• https://exchange.xforce.ibmcloud.com/vulnerabilities/20870
• http://www.phreedom.org/solar/exploits/msasn1-bitstring/
• https://exchange.xforce.ibmcloud.com/vulnerabilities/20870

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