A stack-based buffer overflow vulnerability was found in NBD server implementation in qemu before 2.11 allowing a client to request an expor
A stack-based buffer overflow vulnerability was found in NBD server implementation in qemu before 2.11 allowing a client to request an export name of size up to 4096 bytes, which in fact should be limited to 256 bytes, causing an out-of-bounds stack write in the qemu process. If NBD server requires TLS, the attacker cannot trigger the buffer overflow without first successfully negotiating TLS.
- Published
- Jul 27, 2018
- Updated
- Jun 16, 2026
- EPSS
- 11.9% · 96th percentile
- CWE
- CWE-121
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Report tools
Action score
43
Plan
Add it to your regular patch cycle.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 4 / 30 · 11.9%
CNA vs NVD score
- NVD
- 9.8
- CNA · redhat
- 8.3
- 1.5 point gap
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| qemu | qemu | cpe:2.3:a:qemu:qemu |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- canonical ubuntu linux17.10
- qemu qemubefore 2.11
- redhat enterprise linux7.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
QEMU Qemu
- 2.11affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | qemu | before 1:2.11+dfsg-1 | 1:2.11+dfsg-1 |
| Red Hat:enterprise_linux:7::hypervisor | qemu-img-rhev | before 10:2.10.0-21.el7 | 10:2.10.0-21.el7 |
| Red Hat:enterprise_linux:7::hypervisor | qemu-kvm-common-rhev | before 10:2.10.0-21.el7 | 10:2.10.0-21.el7 |
| Red Hat:enterprise_linux:7::hypervisor | qemu-kvm-rhev | before 10:2.10.0-21.el7 | 10:2.10.0-21.el7 |
| Red Hat:enterprise_linux:7::hypervisor | qemu-kvm-rhev-debuginfo | before 10:2.10.0-21.el7 | 10:2.10.0-21.el7 |
| Red Hat:enterprise_linux:7::hypervisor | qemu-kvm-tools-rhev | before 10:2.10.0-21.el7 | 10:2.10.0-21.el7 |
Same product
qemu: all recordsOther highest-scoring records for the same primary product.
- CVE-2019-12928The QMP migrate command in QEMU version 4.0.0 and earlier is vulnerable to OS command injection, which allows the remote attacker to achieve46Plan
- CVE-2015-8556Local privilege escalation vulnerability in the Gentoo QEMU package before 2.5.0-r1.44Plan
- CVE-2022-36648The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier, allows remote attackers 41Plan
- CVE-2017-16845hw/input/ps2.c in Qemu does not validate 'rptr' and 'count' values during guest migration, leading to out-of-bounds access.41Plan
- CVE-2016-7161Heap-based buffer overflow in the .receive callback of xlnx.xps-ethernetlite in QEMU (aka Quick Emulator) allows attackers to execute arbitr41Plan
- CVE-2016-4002Buffer overflow in the mipsnet_receive function in hw/net/mipsnet.c in QEMU, when the guest NIC is configured to accept large packets, allow41Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:qemu | 1:2.11+dfsg-1 · Debian:12 | Package registry (OSV) |
| red hat:qemu-img-rhev | 10:2.10.0-21.el7 · Red Hat:enterprise_linux:7::hypervisor | Package registry (OSV) |
| red hat:qemu-kvm-common-rhev | 10:2.10.0-21.el7 · Red Hat:enterprise_linux:7::hypervisor | Package registry (OSV) |
| red hat:qemu-kvm-rhev | 10:2.10.0-21.el7 · Red Hat:enterprise_linux:7::hypervisor | Package registry (OSV) |
| red hat:qemu-kvm-rhev-debuginfo | 10:2.10.0-21.el7 · Red Hat:enterprise_linux:7::hypervisor | Package registry (OSV) |
| red hat:qemu-kvm-tools-rhev | 10:2.10.0-21.el7 · Red Hat:enterprise_linux:7::hypervisor | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Exploit-DB entry ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Exploit-DB entry | dos | 2017-11-29 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- First PoC-241 d
- Published
- TodayOct 1, 2026+2988 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-121 · Stack-based Buffer OverflowCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- www.openwall.com/lists/oss-security/2017/11/28/8
- www.securityfocus.com/bid/101975
- access.redhat.com/errata/RHSA-2018:1104
- bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-15118
- usn.ubuntu.com/3575-1/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.