NVD / CVE Program· CNA cisco

CVE-2020-3143: Cisco TelePresence Collaboration Endpoint, TelePresence Codec, and RoomOS Software Path Traversal Vulnerability

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: 8.4% (FIRST EPSS); higher than 95% of all records.
Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.

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

A vulnerability in the video endpoint API (xAPI) of Cisco TelePresence Collaboration Endpoint (CE) Software, Cisco TelePresence Codec (TC) Software, and Cisco RoomOS Software could allow an authenticated, remote attacker to conduct directory traversal attacks on an affected device. The vulnerability is due to insufficient validation of user-supplied input to the xAPI of the affected software. An attacker could exploit this vulnerability by sending a crafted request to the xAPI. A successful exploit could allow the attacker to read and write arbitrary files in the system. To exploit this vulnerability, an attacker would need either an In-Room Control or administrator account.

HighCVSS 7.2 · v3.1—No exploit No fix recorded

Path traversal

BDU:2020-00339

Published: Sep 22, 2020
Updated: Jun 16, 2026
EPSS: 8.4% · 95th percentile
CWE: CWE-22

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 28 / 40 · 7.2 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 3 / 30 · 8.4%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.2
CNA · cisco: 8.8; 1.6 point gap

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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	ex60 firmware	cpe:2.3:o:cisco:ex60_firmware
cisco	ex60	cpe:2.3:h:cisco:ex60
cisco	ex90 firmware	cpe:2.3:o:cisco:ex90_firmware
cisco	ex90	cpe:2.3:h:cisco:ex90
cisco	sx10 firmware	cpe:2.3:o:cisco:sx10_firmware
cisco	sx10	cpe:2.3:h:cisco:sx10
cisco	sx20 firmware	cpe:2.3:o:cisco:sx20_firmware
cisco	sx20	cpe:2.3:h:cisco:sx20
cisco	sx80 firmware	cpe:2.3:o:cisco:sx80_firmware
cisco	sx80	cpe:2.3:h:cisco:sx80
cisco	telepresence codec c40 firmware	cpe:2.3:o:cisco:telepresence_codec_c40_firmware
cisco	telepresence codec c40	cpe:2.3:h:cisco:telepresence_codec_c40

and 30 more

Affected versions

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

cisco ex60 firmwareall versions
cisco ex90 firmwareall versions
cisco sx10 firmwareall versions
cisco sx20 firmwareall versions
cisco sx80 firmwareall versions
cisco telepresence codec c40 firmwareall versions
cisco telepresence codec c60 firmwareall versions
cisco telepresence codec c90 firmwareall versions
cisco telepresence mx200 firmwareall versions
cisco telepresence mx300 firmwareall versions
cisco telepresence mx700 firmwareall versions
cisco telepresence mx800 firmwareall versions
cisco webex board 55 firmwareall versions
cisco webex board 55s firmwareall versions
cisco webex board 70 firmwareall versions
cisco webex board 70s firmwareall versions
cisco webex board 85s firmwareall versions
cisco webex dx70 firmwareall versions
cisco webex dx80 firmwareall versions
cisco webex room 55 firmwareall versions

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 TelePresence TC Software
- n/aaffected

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).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
Administrator privileges are 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: High
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

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

nvd-primary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

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

Vulnerable

1const file = path.join(ROOT, req.query.name);
2res.sendFile(file);

Fixed

1const file = path.resolve(ROOT, req.query.name);
2if (!file.startsWith(ROOT + path.sep)) {
3  return res.sendStatus(400);
4}
5res.sendFile(file);

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-telepresence-path-tr-wdrnYEZZ

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

All records