Unauthenticated service interruption via crafted HTTP header
Published Jun 14, 2021 · Updated Aug 3, 2024
Buffer overflow in SonicWall SonicOS Gen5, Gen6, Gen7, and SonicOSv allows remote attackers to interrupt service via crafted HTTP headers. The web management interface inadequately neutralizes an HTTP header and copies attacker-controlled input without checking the destination buffer size. Unauthenticated network access to HTTP or HTTPS management is required, and successful exploitation interrupts service without reported data disclosure or modification.
Summary
What happened
Buffer overflow in SonicWall SonicOS Gen5, Gen6, Gen7, and SonicOSv allows remote attackers to interrupt service via crafted HTTP headers. The web management interface inadequately neutralizes an HTTP header and copies attacker-controlled input without checking the destination buffer size. Unauthenticated network access to HTTP or HTTPS management is required, and successful exploitation interrupts service without reported data disclosure or modification.
The record
- CVE
- CVE-2021-20027
- Published
- Jun 14, 2021
- Updated
- Aug 3, 2024
- Vendor
- SonicWall
- Product
- SonicOS
- Classifications
- CWE-120, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 14, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=SonicOS 5.9.1.13 and earlier
- Affected versionversion=SonicOS 6.0.5.3 and earlier
- Affected versionversion=SonicOS 6.5.1.12 and earlier
- Affected versionversion=SonicOS 6.5.4.7 and earlier
- Affected versionversion=SonicOS 7.0.1-R1219 and earlier
- Affected versionversion=SonicOS 7.0.1-R1262 and earlier
- Affected versionversion=SonicOS 7.0.1-R514 and earlier
- Affected versionversion=SonicOSv 6.5.4.4 and earlier
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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