CVE-2026-121943

Irontec sngrep through 1.9.0 Out-of-Bounds Stack Read via sip_check_packet

CVSS score

6.3

EPSS probability

—

Risk score

0.6

Published

3 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

DayBreach AI Explanation

Verified against sources

CVE-2026-121943: Irontec sngrep Out-of-Bounds Stack Read Vulnerability

Sources read

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

Irontec sngrep through version 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet (S0). Remote attackers can send crafted UDP or TCP SIP packets or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields (S0).

Why does it matter?

This vulnerability allows attackers to leak sensitive stack data into displayed SIP fields or cause a denial of service via application crashes (S0). The patch status remains unverified in official sources (S0).

What should be done?

Follow vendor advisories for updates (S0)

Chain of evidence and sources2 verified claims

Irontec sngrep 1.9.0 ve önceki sürümler, sip_check_packet fonksiyonunda sınır dışı yığın okuma açığı içermektedir.

S0 · daybreach-canonical

Saldırganlar özel paketler veya pcap dosyaları kullanarak sngrep uygulamasını çökletebilir veya yığın verilerini sızdırabilir.

S0 · daybreach-canonical

Show the technical text from the sources

Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

CVSS vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

CWE: CWE-170

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-121943 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	irontec	sngrep	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
6.3	CVSS V4_0	MEDIUM	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N	CVE CNA
6.3	CVSS V40	MEDIUM	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD
4.8	CVSS V3_1	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L	CVE CNA
4.8	CVSS V31	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-121943 is associated with the following CWEs:

CWE-170: Common Weakness Enumeration Entry CWE-170

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-121943 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

https://github.com/irontec/sngrep/issues/589vendor-advisory https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-readvendor-advisory https://github.com/irontec/sngrep/blob/v1.9.0/src/sip.c#L396-L410vendor-advisory VulnCheck Advisory: Irontec sngrep through 1.9.0 Out-of-Bounds Stack Read via sip_check_packetvendor-advisory

CVSS Vector Radar Chart

6.3 / 10

Vulnerability Scoring Details

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)High

Integrity (Bütünlük)None

Availability (Erişilebilirlik)Low

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

irontec

Weakness Type (CWE & CAPEC)

CWE-170

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