CVE-2007-4553

Exp

The Thomson ST 2030 SIP phone with software 1.52.1 allows remote attackers to cause a denial of service (device hang) via an INVITE message with a Via header that contains a '/' (slash) instead of the required space following the SIP version number.

Published: 2007-08-28 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2007-4553 is rated High Exploit Risk (73.8/100): CVSS Medium severity, with high exploitation likelihood (EPSS 27.18%, 96th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +5.17% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2007-4553

EDB-ID Source Kind Published Link
30530 exploit_db edb 2007-08-27 Exploit-DB ↗
4319 exploit_db edb 2007-08-27 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2007-4553

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-30 22.01% 27.18% +5.17%
2 2026-04-16 21.36% 22.01% +0.65%
3 2026-01-06 — 21.36% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2007-4553

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2007-4553

Affected software / configurations for CVE-2007-4553

Vendor Product Version Raw CPE
thomson st_2030_sip_phone 1 cpe:2.3:h:thomson:st_2030_sip_phone:1:1.52.1_firmware:*:*:*:*:*:*

References for CVE-2007-4553

cvelogic Threat Intelligence