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CVE-2020-5763· NVD / CVE Program· CNA tenable

Grandstream HT800 series firmware version 1.0.17.5 and below contain a backdoor in the SSH service.

Grandstream HT800 series firmware version 1.0.17.5 and below contain a backdoor in the SSH service. An authenticated remote attacker can obtain a root shell by correctly answering a challenge prompt.

HighCVSS 8.8 · v3.1—No exploit No fix recorded
Published
Jul 29, 2020
Updated
Jun 16, 2026
EPSS
2.7% · 86th percentile
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Action score

36

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.7%

Affected systems

VendorProduct
grandstreamht801 firmware
grandstreamht801
grandstreamht802 firmware
grandstreamht802
grandstreamht812 firmware
grandstreamht812
grandstreamht814 firmware
grandstreamht814
grandstreamht818 firmware
grandstreamht818
grandstreamht813 firmware
grandstreamht813

Affected versions

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

  • grandstream ht801 firmwareup to 1.0.17.5 inclusive
  • grandstream ht802 firmwareup to 1.0.17.5 inclusive
  • grandstream ht812 firmwareup to 1.0.17.5 inclusive
  • grandstream ht813 firmwareup to 1.0.17.5 inclusive
  • grandstream ht814 firmwareup to 1.0.17.5 inclusive
  • grandstream ht818 firmwareup to 1.0.17.5 inclusive

Versions reported by the vendor

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

  • n/a Grandstream HT800 Series

    • Versions 1.0.17.5 and belowaffected

Same product

grandstream: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-37748Multiple buffer overflows in the limited configuration shell (/sbin/gs_config) on Grandstream HT801 devices before 1.0.29 allow remote authe
    37Monitor
  • CVE-2021-37915An issue was discovered on the Grandstream HT801 Analog Telephone Adaptor before 1.0.29.8.
    36Monitor
  • CVE-2020-5760Grandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to an OS command injection vulnerability.
    33Monitor
  • CVE-2020-5762Grandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to a denial of service attack against the TR-069 service.
    31Monitor
  • CVE-2020-5761Grandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to CPU exhaustion due to an infinite loop in the TR-069 service.
    31Monitor

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.

EPSS, last 120 days

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 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.
  • 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
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-489 · Active Debug Code

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/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.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; 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 help

Change log

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

References

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

All records