CVE-2020-5635: Aterm SA3500G firmware versions prior to Ver

Q: How do I fix CVE-2020-5635?

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

Q: Is CVE-2020-5635 being exploited?

CVE-2020-5635 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-2020-5635 affect?

CVE-2020-5635 affects aterm sa3500g firmware. Severity is high (CVSS 8.8). Aterm SA3500G firmware versions prior to Ver. 3.5.9 allows an attacker on the adjacent network to send a specially crafted request to a specific URL, which may result in an arbitrary command execution.

This month

HIGH 8.8UPGRADE

CVE-2020-5635 is a high-severity flaw (CVSS 8.8) 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 on the adjacent network to send a specially crafted request to a specific URL, which may result in an arbitrary command execution.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
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-2020-5635?

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

Is CVE-2020-5635 being exploited?

CVE-2020-5635 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-2020-5635 affect?

CVE-2020-5635 affects aterm sa3500g firmware. Severity is high (CVSS 8.8). Aterm SA3500G firmware versions prior to Ver. 3.5.9 allows an attacker on the adjacent network to send a specially crafted request to a specific URL, which may result in an arbitrary command execution.

How urgent is CVE-2020-5635?

Priority 47/100. High severity

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-2020-5636 MEDIUM 6.8 UPGRADE Aterm SA3500G firmware versions prior to Ver

References

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