NVD / CVE Program· CNA Linux

CVE-2021-47347: wl1251: Fix possible buffer overflow in wl1251_cmd_scan

HighCVSS 7.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 31/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.81% (FIRST EPSS); higher than 57.3% of all records.
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 0f6c0488368c9ac1aa685821916fadba32f5d1ef, 115103f6e3f1c26c473766c16439c7c8b235529a, 302e2ee34c5f7c5d805b7f835d9a6f2b43474e2a.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0f6c0488368c9ac1aa685821916fadba32f5d1ef, 115103f6e3f1c26c473766c16439c7c8b235529a, 302e2ee34c5f7c5d805b7f835d9a6f2b43474e2a or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: wl1251: Fix possible buffer overflow in wl1251_cmd_scan Function wl1251_cmd_scan calls memcpy without checking the length. Harden by checking the length is within the maximum allowed size.

Memory safety

Published: May 21, 2024
Updated: Aug 5, 2026
EPSS: 0.8% · 57th percentile
CWE: CWE-120

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.8%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 7.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 2.6.31affected
- 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 and later · before 57ad99ae3c6738ba87bad259bb57c641ca68ebf6affected · git
- 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 and later · before d3d8b9c9c7843dce31e284927d4c9904fd5a510aaffected · git
- 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 and later · before 0f6c0488368c9ac1aa685821916fadba32f5d1efaffected · git
- 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 and later · before 115103f6e3f1c26c473766c16439c7c8b235529aaffected · git
- 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 and later · before d71dddeb5380613f9ef199f3e7368fd78fb1a46eaffected · git
- 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 and later · before c5e4a10d7bd5d4f419d8b9705dff60cf69b302a1affected · git
- 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 and later · before 302e2ee34c5f7c5d805b7f835d9a6f2b43474e2aaffected · git
- 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 and later · before 40af3960a15339e8bbd3be50c3bc7b35e1a0b6eaaffected · git
- 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 and later · before d10a87a3535cce2b890897914f5d0d83df669c63affected · git

Affected versions · NVD (8)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernelbefore 4.4.276
linux linux kernel4.5 and later · before 4.9.276
linux linux kernel4.10 and later · before 4.14.240
linux linux kernel4.15 and later · before 4.19.198
linux linux kernel4.20 and later · before 5.4.133
linux linux kernel5.5 and later · before 5.10.51
linux linux kernel5.11 and later · before 5.12.18
linux linux kernel5.13 and later · before 5.13.3

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 5.14.6-1	5.14.6-1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-default	before 3.0.101-108.156.1	3.0.101-108.156.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-ec2	before 3.0.101-108.156.1	3.0.101-108.156.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-source	before 3.0.101-108.156.1	3.0.101-108.156.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-syms	before 3.0.101-108.156.1	3.0.101-108.156.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-trace	before 3.0.101-108.156.1	3.0.101-108.156.1
SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	kernel-xen	before 3.0.101-108.156.1	3.0.101-108.156.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2021-47345May 21, 2024 · RDMA/cma: Fix rdma_resolve_route() memory leak
22Monitor
← EarlierCVE-2021-47346May 21, 2024 · coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()
28Monitor
Later →CVE-2021-47348May 21, 2024 · drm/amd/display: Avoid HDCP over-read and corruption
36Monitor

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
Linux Linux	0f6c0488368c9ac1aa685821916fadba32f5d1ef	Vendor (CNA)
Linux Linux	115103f6e3f1c26c473766c16439c7c8b235529a	Vendor (CNA)
Linux Linux	302e2ee34c5f7c5d805b7f835d9a6f2b43474e2a	Vendor (CNA)
Linux Linux	40af3960a15339e8bbd3be50c3bc7b35e1a0b6ea	Vendor (CNA)
Linux Linux	57ad99ae3c6738ba87bad259bb57c641ca68ebf6	Vendor (CNA)
Linux Linux	c5e4a10d7bd5d4f419d8b9705dff60cf69b302a1	Vendor (CNA)
Linux Linux	d10a87a3535cce2b890897914f5d0d83df669c63	Vendor (CNA)
Linux Linux	d3d8b9c9c7843dce31e284927d4c9904fd5a510a	Vendor (CNA)
Linux Linux	d71dddeb5380613f9ef199f3e7368fd78fb1a46e	Vendor (CNA)
debian:linux	5.14.6-1 · Debian:12	Package registry (OSV)
suse:kernel-default	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package registry (OSV)
suse:kernel-ec2	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package registry (OSV)
suse:kernel-source	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package registry (OSV)
suse:kernel-syms	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package registry (OSV)
suse:kernel-trace	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package registry (OSV)
suse:kernel-xen	3.0.101-108.156.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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.

No dated events beyond publication.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2023-44466235 days apartAn issue was discovered in net/ceph/messenger_v2.c in the Linux kernel before 6.4.5.
48Plan
CVE-2023-527350 days apartbpf, sockmap: Don't let sock_map_{close,destroy,unhash} call itself
36Monitor
CVE-2024-2692723 days apartASoC: SOF: Add some bounds checking to firmware data
33Monitor
CVE-2021-474851 days apartIB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields
31Monitor
CVE-2024-274074 days apartfs/ntfs3: Fixed overflow check in mi_enum_attr()
31Monitor
CVE-2024-2695220 days apartksmbd: fix potencial out-of-bounds when buffer offset is invalid
31Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-24-0519 · May 22, 2024(Linux Kernel Güncellemesi)

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
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: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log (1)

Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/0f6c0488368c9ac1aa685821916fadba32f5d1ef

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records