NVD / CVE Program· CNA cisco

CVE-2022-20841: Cisco Small Business RV Series Routers Vulnerabilities

Noroxi assessment

Priority: Monitor (action score 37/100)

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: 3.4% (FIRST EPSS); higher than 88.8% 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. Special conditions such as timing or configuration are required.
According to the record, no fixed version is available yet.
Mentioned 3 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. 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

Multiple vulnerabilities in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

CriticalCVSS 9.0 · v3.1—No exploit No fix recorded

BDU:2022-04801

Published: Aug 10, 2022
Updated: Jun 17, 2026
EPSS: 3.4% · 88th percentile
CWE: CWE-120

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 36 / 40 · 9.0 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 3.4%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 9.0
CNA · cisco: 9.0; agree

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
No fixed version yet

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

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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
cisco	rv160 firmware	cpe:2.3:o:cisco:rv160_firmware
cisco	rv160	cpe:2.3:h:cisco:rv160
cisco	rv160w firmware	cpe:2.3:o:cisco:rv160w_firmware
cisco	rv160w	cpe:2.3:h:cisco:rv160w
cisco	rv260 firmware	cpe:2.3:o:cisco:rv260_firmware
cisco	rv260	cpe:2.3:h:cisco:rv260
cisco	rv260p firmware	cpe:2.3:o:cisco:rv260p_firmware
cisco	rv260p	cpe:2.3:h:cisco:rv260p
cisco	rv260w firmware	cpe:2.3:o:cisco:rv260w_firmware
cisco	rv260w	cpe:2.3:h:cisco:rv260w
cisco	rv340 firmware	cpe:2.3:o:cisco:rv340_firmware
cisco	rv340	cpe:2.3:h:cisco:rv340

and 6 more

Affected versions

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

cisco rv160 firmwarebefore 1.0.01.05
cisco rv160w firmwarebefore 1.0.01.05
cisco rv260 firmwarebefore 1.0.01.05
cisco rv260p firmwarebefore 1.0.01.05
cisco rv260w firmwarebefore 1.0.01.05
cisco rv340 firmwarebefore 1.0.03.26
cisco rv340w firmwarebefore 1.0.03.26
cisco rv345 firmwarebefore 1.0.03.26
cisco rv345p firmwarebefore 1.0.03.26

Versions reported by the vendor

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

Cisco Cisco Small Business RV Series Router Firmware
- n/aaffected

Same product

cisco: all records

Other highest-scoring records for the same primary product.

CVE-2021-1472Cisco Small Business RV Series Routers Vulnerabilities
61This week
CVE-2022-20827Cisco Small Business RV Series Routers Vulnerabilities
41Plan

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-22-0542 · Aug 11, 2022(Cisco Güvenlik Zafiyeti)
TR-22-0528 · Aug 5, 2022(Cisco Güvenlik Güncellemesi)
TR-22-0524 · Aug 4, 2022(Cisco Güvenlik Zafiyeti)

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.
Special conditions such as timing or configuration are required.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: Changed
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:H/PR:N/UI:N/S:C/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

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-mult-vuln-CbVp4SUR

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

All records