HOMEVULNERABILITIESCVE-2018-16657
CRITICAL

CVE-2018-16657

CWE-476Published: September 7, 2018· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

In Kamailio before 5.0.7 and 5.1.x before 5.1.4, a crafted SIP message with an invalid Via header causes a segmentation fault and crashes Kamailio. The reason is missing input validation in the crcitt_string_array core function for calculating a CRC hash for To tags. (An additional error is present in the check_via_address core function: this function also misses input validation.) This could result in denial of service and potentially the execution of arbitrary code.

NVD Source

Technical Analysis

CVE-2018-16657 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
kamailio1 product(s)
kamailio
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://skalatan.de/blog/advisory-hw-2018-06
PATCHhttps://skalatan.de/blog/advisory-hw-2018-06
ADVISORYhttps://lists.debian.org/debian-lts-announce/2018/09/msg00013.html
ADVISORYhttps://www.debian.org/security/2018/dsa-4292
ADVISORYhttps://lists.debian.org/debian-lts-announce/2018/09/msg00013.html
ADVISORYhttps://www.debian.org/security/2018/dsa-4292

All References (6)

→
https://lists.debian.org/debian-lts-announce/2018/09/msg00013.htmlMailing List · Third Party Advisory
→
https://skalatan.de/blog/advisory-hw-2018-06Exploit · Patch · Third Party Advisory
→
https://www.debian.org/security/2018/dsa-4292Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2018/09/msg00013.htmlMailing List · Third Party Advisory
→
https://skalatan.de/blog/advisory-hw-2018-06Exploit · Patch · Third Party Advisory
→
https://www.debian.org/security/2018/dsa-4292Third Party Advisory

Quick Facts

CVE IDCVE-2018-16657
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-476
CISA KEVNo
Affected2 vendor(s)
PublishedSep 7, 2018

Related CVEs (CWE-476)

CVE-2010-2495
10.0
CVE-2022-36648
10.0
CVE-2017-14625
9.8
CVE-2017-14626
9.8
CVE-2017-14532
9.8
CVE-2017-14624
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-16657 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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