Unauthenticated file writes via improperly authenticated requests
Published Sep 3, 2025 · Updated Sep 3, 2025
Improper access control in Cisco SIP Software allows remote attackers to write files to phone OS directories through Web Access. The phone web interface accepts a crafted request without proper authentication and writes attacker-supplied files into specific underlying OS directories. Web Access must be enabled and is disabled by default; exploitation requires no credentials or user interaction and alters files only in those directories.
Summary
What happened
Improper access control in Cisco SIP Software allows remote attackers to write files to phone OS directories through Web Access. The phone web interface accepts a crafted request without proper authentication and writes attacker-supplied files into specific underlying OS directories. Web Access must be enabled and is disabled by default; exploitation requires no credentials or user interaction and alters files only in those directories.
The record
- CVE
- CVE-2025-20335
- Published
- Sep 3, 2025
- Updated
- Sep 3, 2025
- Vendor
- ClamAV
- Product
- Cisco Session Initiation Protocol (SIP) Software
- Classifications
- CWE-284, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 3, 2025CVE publishedPublication date reported by the CVE source.
- Sep 3, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.1(1.9)
- Affected versionversion=10.1(1)SR1
- Affected versionversion=10.1(1)SR2
- Affected versionversion=10.2(1)
- Affected versionversion=10.2(1)SR1
- Affected versionversion=10.2(2)
- Affected versionversion=10.3(1)
- Affected versionversion=10.3(1.11) 3rd Party
- Affected versionversion=10.3(1.9) 3rd Party
- Affected versionversion=10.3(1)SR1
- Affected versionversion=10.3(1)SR2
- Affected versionversion=10.3(1)SR3
- Affected versionversion=10.3(1)SR4
- Affected versionversion=10.3(1)SR4b
- Affected versionversion=10.3(1)SR5
- Affected versionversion=10.3(1)SR6
- Affected versionversion=10.3(1)SR7
- Affected versionversion=10.3(2)
- Affected versionversion=10.4(1) 3rd Party
- Affected versionversion=10.4(1)SR2 3rd Party
- Affected versionversion=11.0(0.7) MPP
- Affected versionversion=11.0(1)
- Affected versionversion=11-0-1MSR1-1
- Affected versionversion=11.0(2)
- Affected versionversion=11.0(2)SR1
- Affected versionversion=11.0(2)SR2
- Affected versionversion=11.0(3)
- Affected versionversion=11.0(3)SR1
- Affected versionversion=11.0(3)SR2
- Affected versionversion=11.0(3)SR3
- Affected versionversion=11.0(3)SR4
- Affected versionversion=11.0(3)SR5
- Affected versionversion=11.0(3)SR6
- Affected versionversion=11.0(4)
- Affected versionversion=11.0(4)SR1
- Affected versionversion=11.0(4)SR2
- Affected versionversion=11.0(4)SR3
- Affected versionversion=11.0(5)
- Affected versionversion=11.0(5)SR1
- Affected versionversion=11.0(5)SR2
- Affected versionversion=11.0(5)SR3
- Affected versionversion=11.0(6)
- Affected versionversion=11.0(6)SR1
- Affected versionversion=11.0(6)SR2
- Affected versionversion=11.0(6)SR4
- Affected versionversion=11.0(6)SR5
- Affected versionversion=11.0(6)SR6
- Affected versionversion=11.5(1)
- Affected versionversion=11.5(1)SR1
- Affected versionversion=11.7(1)
- Affected versionversion=12.0(1)
- Affected versionversion=12.0(1)SR1
- Affected versionversion=12.0(1)SR2
- Affected versionversion=12.0(1)SR3
- Affected versionversion=12.1(1)
- Affected versionversion=12.1(1)SR1
- Affected versionversion=12.5(1)
- Affected versionversion=12.5(1)SR1
- Affected versionversion=12.5(1)SR2
- Affected versionversion=12.5(1)SR3
- Affected versionversion=12.6(1)
- Affected versionversion=12.6(1)SR1
- Affected versionversion=12.7(1)
- Affected versionversion=12.7(1)SR1
- Affected versionversion=12.8(1)
- Affected versionversion=12.8(1)SR1
- Affected versionversion=12.8(1)SR2
- Affected versionversion=14.0(1)
- Affected versionversion=14.0(1)SR1
- Affected versionversion=14.0(1)SR2
- Affected versionversion=14.0(1)SR3
- Affected versionversion=14.1(1)
- Affected versionversion=14.1(1)SR1
- Affected versionversion=14.1(1)SR2
- Affected versionversion=14.1(1)SR3
- Affected versionversion=14.2(1)
- Affected versionversion=14.2(1)SR1
- Affected versionversion=14.2(1)SR2
- Affected versionversion=14.2(1)SR3
- Affected versionversion=14.2(1)SR4
- Affected versionversion=14.3(1)
- Affected versionversion=14.3(1)SR1
- Affected versionversion=2.0(1)
- Affected versionversion=2.1(1)
- Affected versionversion=2.2(1)
- Affected versionversion=2.3(1)
- Affected versionversion=2.3(1)SR1
- Affected versionversion=3.0(1)
- Affected versionversion=3.1(1)
- Affected versionversion=3.1(1)SR1
- Affected versionversion=3.2(1)
- Affected versionversion=9.3(3)
- Affected versionversion=9.3(4) 3rd Party
- Affected versionversion=9.3(4)SR1 3rd Party
- Affected versionversion=9.3(4)SR2 3rd Party
- Affected versionversion=9.3(4)SR3 3rd Party
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.
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
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Your stack
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