LiveActive security incident?Get immediate response
CVE Record

CVE-2018-8828: A Buffer Overflow issue was discovered in Kamailio before 4.4.7, 5.0.x before 5.0.6, and 5.1.x before 5.1.2.

A Buffer Overflow issue was discovered in Kamailio before 4.4.7, 5.0.x before 5.0.6, and 5.1.x before 5.1.2. A specially crafted REGISTER message with a malformed branch or From tag triggers an off-by-one heap-based buffer overflow in the tmx_check_pretran function in modules/tmx/tmx_pretran.c.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2018-8828 affects older Kamailio SIP servers. A malformed SIP REGISTER message can trigger a heap buffer overflow. For organizations using Kamailio in voice or SIP routing infrastructure, the main business risk is service disruption or memory corruption in an exposed communications component.

Executive priority

Prioritize patching if Kamailio is internet-facing, supports customer voice services, or sits in a critical call-routing path. If Kamailio is not deployed, this CVE is not directly applicable based on the provided sources.

Technical view

Kamailio before 4.4.7, 5.0.x before 5.0.6, and 5.1.x before 5.1.2 contain an off-by-one heap-based buffer overflow in modules/tmx/tmx_pretran.c, tmx_check_pretran. The trigger is a specially crafted REGISTER message with a malformed branch or From tag.

Likely exposure

Exposure is likely limited to organizations running affected Kamailio versions, especially systems processing SIP REGISTER traffic. The provided CVE data does not identify specific CPEs or downstream appliance products.

Exploitation context

The source bundle describes a crafted REGISTER message trigger, but does not cite active exploitation, public weaponization, or KEV listing. Treat internet-facing or partner-facing SIP services as higher priority because the affected parser path is remotely reachable by design.

Researcher notes

Evidence is strong for affected versions, vulnerable file/function, and message type. The bundle does not provide CVSS, CWE, exploit maturity, authentication requirements, or proven impact beyond heap overflow. Avoid assuming remote code execution without additional vendor evidence.

Mitigation direction

  • Upgrade Kamailio to 4.4.7, 5.0.6, 5.1.2, or later.
  • Apply Debian DSA-4148 updates where Debian packages are used.
  • Apply Ubuntu USN-4240-1 updates where Ubuntu packages are used.
  • Review Kamailio vendor guidance and downstream package advisories.
  • Limit SIP REGISTER exposure to trusted networks where operationally possible.

Validation and detection

  • Inventory Kamailio instances and record exact running versions.
  • Check package manager history for Debian DSA-4148 or Ubuntu USN-4240-1 updates.
  • Confirm SIP services handling REGISTER traffic are not on vulnerable versions.
  • Review logs for malformed REGISTER traffic around exposed SIP endpoints.
  • Verify staging and production use the same patched package stream.
Prepared
Confidence
high
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2018-8828 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.