Security readout for executives and security teams
Plain-English summary
CVE-2026-15548 is a critical stack buffer overflow in Shibby Tomato router firmware DNS list rendering. A remote authenticated attacker could potentially compromise confidentiality, integrity, and availability on affected devices. The source says Shibby Tomato is superseded by FreshTomato, and no vendor patch is identified in the bundle.
Executive priority
Prioritize identifying and isolating affected router management interfaces. Business risk is high because compromise of edge devices can enable traffic interception, persistence, and network disruption, while the bundle provides no confirmed patch path.
Technical view
The issue affects /usr/sbin/httpd, function sub_407220, in Shibby Tomato through 1.28.0000. Manipulated DNS list rendering input can trigger CWE-119/CWE-121 stack-based overflow. CVSS v2 is 9.0 with AV:N/AC:L/Au:S and C/I/A complete impact. Reported exploit maturity is PoC.
Likely exposure
Exposure is likely limited to organizations still running Shibby Tomato firmware versions 1.0 through 1.28.0000, especially where the router web interface is reachable by authenticated users over a network.
Exploitation context
The bundle does not show CISA KEV listing or confirmed active exploitation. It does indicate proof-of-concept maturity and remote authenticated attack conditions. Treat internet-exposed or broadly reachable management interfaces as higher urgency.
Researcher notes
Evidence is mostly third-party advisory data from VulDB and the CVE record. The affected function and component are named, but the bundle does not provide a vendor patch, full root-cause details, or confirmed in-the-wild exploitation.
Mitigation direction
- Inventory routers and confirm whether Shibby Tomato firmware is present.
- Restrict httpd management access to trusted administrative networks only.
- Disable remote administration where it is not required.
- Check Shibby Tomato, FreshTomato, and device-vendor guidance for supported remediation.
- Plan replacement or migration away from unsupported Shibby Tomato builds.
Validation and detection
- Check firmware version and identify Shibby Tomato builds through 1.28.0000.
- Review whether the web management interface is reachable from untrusted networks.
- Confirm administrative access requires strong authentication and limited source networks.
- Search logs for unusual authenticated access to router management pages.
- Track the CVE record and VulDB entry for updated remediation details.
Public sources used
- CVE Program
- CVE List V5
- VDB-377898 | Shibby Tomato DNS List Rendering httpd sub_407220 stack-based overflow
- VDB-377898 | CTI Indicators (IOB, IOC, IOA)
- CVE-2026-15548 | CVE Analysis and Report
- Submit #855121 | Tomato by Shibby Tomato Firmware Tomato v1.28 RT-N5x MIPSR2 build 132 Max Stack-based Buffer Overflow
- Gitee issue IJTQ5R
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
CWE-119: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-121: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-15548 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9 (2.0)
- Known Exploited
- No
- Published
Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
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.
SSVC decision data
CVSS vector scores
4 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR810VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R2.85.9VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R2.85.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P——VulDBVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
Base CVSS 3.0 score
8.8HighVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
Base CVSS 2.0 score
9CriticalVector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timelineVulDB
Advisory disclosed
- Source timelineVulDB
VulDB entry created
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelineVulDB
VulDB entry last update
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- VDB-377898 | Shibby Tomato DNS List Rendering httpd sub_407220 stack-based overflowCVE reference, VulDB · vdb-entry, technical-description
- VDB-377898 | CTI Indicators (IOB, IOC, IOA)CVE reference, VulDB · signature, permissions-required
- CVE-2026-15548 | CVE Analysis and ReportCVE reference, VulDB · third-party-advisory
- Submit #855121 | Tomato by Shibby Tomato Firmware Tomato v1.28 RT-N5x MIPSR2 build 132 Max Stack-based Buffer OverflowCVE reference, VulDB · third-party-advisory
- https://gitee.com/Fengyi-Wang/CVE/issues/IJTQ5RCVE reference, VulDB · issue-tracking
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Restriction of Operations within the Bounds of a Memory Buffer
Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.