CyberSecBulletin
CVE-2026-49435NVD status: Awaiting Analysis

Hawkeye: Stack-based Buffer Overflow

Published Updated By the CyberSecBulletin desk

CVE-2026-49435 is a critical-severity stack-based buffer overflow vulnerability in Hawkeye from Keysight, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 6.0.7 as the first without the flaw, so updating Hawkeye to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.42% chance of exploitation within 30 days, higher than 73% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update Hawkeye to 6.0.7 or a later version.
  2. Update IxChariot to 10.0.254 or a later version.
  3. Update IxTap to 3.13.0 or a later version.
  4. Read the advisory on keysight.com for workarounds and exact fixed builds.
  5. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
KeysightHawkeyebefore 6.0.76.0.7
KeysightIxChariotbefore 10.0.25410.0.254
KeysightIxTapbefore 3.13.03.13.0
KeysightIxProbebefore 3.13.03.13.0
KeysightIxByPassbefore 3.13.0.693.13.0.69

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA.

Scoring systemScoreSeverityScored by
CVSS 4.09.3CriticalCNA
CVSS 3.19.8CriticalCNA

Official description

Keysight IxChariot Endpoint and associated products contain a stack-based buffer overflow. An unauthenticated remote attacker can send a specially crafted packet and execute arbitrary code with administrative privileges.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Stack-based Buffer Overflow

The product writes past the end of a buffer that was allocated on the stack.

How developers prevent this class of flaw

  • Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND discusses canary-based detection in detail.
  • Use an abstraction library to abstract away risky APIs. Not a complete solution.
  • Implement and perform bounds checking on input.

More Stack-based Buffer Overflow vulnerabilities (CWE-121)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Stack-based Buffer Overflow vulnerabilities

Spotted an error? Tell us.