CVE-2020-5636: Aterm SA3500G firmware versions prior to Ver

Q: How do I fix CVE-2020-5636?

aterm sa3500g firmware: upgrade to 3.5.9. Exact commands for each OS are on this page.

Q: Is CVE-2020-5636 being exploited?

CVE-2020-5636 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-5636 affect?

CVE-2020-5636 affects aterm sa3500g firmware. Severity is medium (CVSS 6.8). Aterm SA3500G firmware versions prior to Ver. 3.5.9 allows an attacker with an administrative privilege to send a specially crafted request to a specific URL, which may result in an arbitrary command execution.

Q: How urgent is CVE-2020-5636?

Priority 38/100. No elevated risk signals yet.

Routine

MEDIUM 6.8UPGRADE

CVE-2020-5636 is a medium-severity flaw (CVSS 6.8) affecting aterm sa3500g firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Aterm SA3500G firmware versions prior to Ver. 3.5.9 allows an attacker with an administrative privilege to send a specially crafted request to a specific URL, which may result in an arbitrary command execution.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-78
Published	2020-12-14
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: necplatforms

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-12-14 03:15 UTCPublished CVE record published
2026-06-17 03:21 UTCUpdated Record last modified

necplatforms aterm sa3500g firmware UPGRADE

Affected: < 3.5.9

Fixed in: 3.5.9

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-5636?

aterm sa3500g firmware: upgrade to 3.5.9. Exact commands for each OS are on this page.

Is CVE-2020-5636 being exploited?

CVE-2020-5636 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-5636 affect?

CVE-2020-5636 affects aterm sa3500g firmware. Severity is medium (CVSS 6.8). Aterm SA3500G firmware versions prior to Ver. 3.5.9 allows an attacker with an administrative privilege to send a specially crafted request to a specific URL, which may result in an arbitrary command execution.

How urgent is CVE-2020-5636?

Priority 38/100. No elevated risk signals yet.

Related CVEs

CVE-2020-5637 MEDIUM 6.8 UPGRADE Improper validation of integrity check value vulnerability in Aterm SA3500G firmware versions prior to Ver
CVE-2020-5635 HIGH 8.8 UPGRADE Aterm SA3500G firmware versions prior to Ver

References

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