NVD / CVE Program· CNA sonicwall

CVE-2021-20045: A buffer overflow vulnerability in SMA100 sonicfiles RAC_COPY_TO (RacNumber 36) method allows a remote unauthenticated attacker to potential

Noroxi assessment

Priority: Plan (action score 47/100)

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: 25.2% (FIRST EPSS); higher than 97.9% of all records.
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.
According to the record, no fixed version is available yet.
Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Add it to your regular patch cycle. Update when a fix is released; follow the vendor's advisory.

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

A buffer overflow vulnerability in SMA100 sonicfiles RAC_COPY_TO (RacNumber 36) method allows a remote unauthenticated attacker to potentially execute code as the 'nobody' user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded

Published: Dec 8, 2021
Updated: Jun 16, 2026
EPSS: 25.2% · 97th percentile
CWE: CWE-120

Report tools

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Action score

Plan

Add it to your regular patch cycle.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 8 / 30 · 25.2%

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

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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.

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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
sonicwall	sma 200 firmware	cpe:2.3:o:sonicwall:sma_200_firmware
sonicwall	sma 200	cpe:2.3:h:sonicwall:sma_200
sonicwall	sma 210 firmware	cpe:2.3:o:sonicwall:sma_210_firmware
sonicwall	sma 210	cpe:2.3:h:sonicwall:sma_210
sonicwall	sma 410 firmware	cpe:2.3:o:sonicwall:sma_410_firmware
sonicwall	sma 410	cpe:2.3:h:sonicwall:sma_410
sonicwall	sma 400 firmware	cpe:2.3:o:sonicwall:sma_400_firmware
sonicwall	sma 400	cpe:2.3:h:sonicwall:sma_400
sonicwall	sma 500v firmware	cpe:2.3:o:sonicwall:sma_500v_firmware
sonicwall	sma 500v	cpe:2.3:h:sonicwall:sma_500v

Using sma 200 firmware? Add it to your stack and be the first to know about CVEs like this one. (VPN gateway)

Affected versions

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

sonicwall sma 200 firmware10.2.0.8-37sv
sonicwall sma 200 firmware10.2.1.1-19sv
sonicwall sma 210 firmware10.2.0.8-37sv
sonicwall sma 210 firmware10.2.1.1-19sv
sonicwall sma 400 firmware10.2.0.8-37sv
sonicwall sma 400 firmware10.2.1.1-19sv
sonicwall sma 410 firmware10.2.0.8-37sv
sonicwall sma 410 firmware10.2.1.1-19sv
sonicwall sma 500v firmware10.2.0.8-37sv
sonicwall sma 500v firmware10.2.1.1-19sv

Versions reported by the vendor

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

SonicWall SonicWall SMA100
- 10.2.0.8-37sv and earlier, 10.2.1.1-19sv and earlier, 10.2.1.2-24sv and earlieraffected

Same product

sonicwall: all records

Other highest-scoring records for the same primary product.

CVE-2021-20038A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticKEV
99Now
CVE-2023-44221Improper neutralization of special elements in the SMA100 SSL-VPN management interface allows a remote authenticated attacker with administrKEV
81Now
CVE-2021-20034An improper access control vulnerability in SMA100 allows a remote unauthenticated attacker to bypass the path traversal checks and delete a
61This week

Published before and after this one in the same product

← EarlierCVE-2021-20043Dec 8, 2021 · A Heap-based buffer overflow vulnerability in SonicWall SMA100 getBookmarks method allows a remote authenticated attacker to potentially exe
42Plan
← EarlierCVE-2021-20044Dec 8, 2021 · A post-authentication remote command injection vulnerability in SonicWall SMA100 allows a remote authenticated attacker to execute OS system
47Plan
Later →CVE-2022-22273Mar 16, 2022 · Improper neutralization of Special Elements leading to OS Command Injection vulnerability impacting end-of-life Secure Remote Access (SRA) p
40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

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.

No history yet (it accumulates with the daily EPSS job).

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 researchers

Finders, 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

TR-22-0006 · Jan 4, 2022(SonicWall Güvenlik Zafiyeti)
TR-21-0978 · Dec 9, 2021(SonicWall Güvenlik Güncellemesi)

All national notices →

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

CVSS vector

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

nvd-primary

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

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026

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

All records