CVE-2020-23591: A vulnerability in OPTILINK OP-XT71000N Hardware Version: V2.2 , Firmware Version: OP_V3.3.1-191028 allows an

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CRITICAL 9.8REMOTEMITIGATE

CVE-2020-23591 is a critical-severity flaw (CVSS 9.8) affecting op-xt71000n firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in OPTILINK OP-XT71000N Hardware Version: V2.2 , Firmware Version: OP_V3.3.1-191028 allows an attacker to upload arbitrary files through " /mgm_dev_upgrade.asp " which can "delete every file for Denial of Service (using 'rm -rf *.*' in the code), reverse connection (using '.asp' webshell), backdoor.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-434
Published	2022-11-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: optilinknetwork

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

Am I affected?

Timeline

2022-11-23 02:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

optilinknetwork op-xt71000n firmware MITIGATE

Affected: 3.3.1-191028

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.3.1-191028

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-2020-23591?

op-xt71000n firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-23591 being exploited?

CVE-2020-23591 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-2020-23591 affect?

CVE-2020-23591 affects op-xt71000n firmware. Severity is critical (CVSS 9.8). A vulnerability in OPTILINK OP-XT71000N Hardware Version: V2.2 , Firmware Version: OP_V3.3.1-191028 allows an attacker to upload arbitrary files through " /mgm_dev_upgrade.asp " which can "delete every file for Denial of Service (using 'rm

How urgent is CVE-2020-23591?

Priority 56/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-23593 MEDIUM 6.5 MITIGATE A vulnerability in OPTILINK OP-XT71000N Hardware Version: V2.2, Firmware Version: OP_V3.3.1-191028 allows an u
CVE-2020-23592 HIGH 8.8 MITIGATE A vulnerability in OPTILINK OP-XT71000N Hardware Version: V2.2 , Firmware Version: OP_V3.3.1-191028 allows an
CVE-2020-23590 MEDIUM 6.5 MITIGATE A vulnerability in Optilink OP-XT71000N Hardware version: V2.2 , Firmware Version: OP_V3.3.1-191028 allows an
CVE-2020-23589 MEDIUM 6.5 MITIGATE A vulnerability in OPTILINK OP-XT71000N Hardware Version: V2.2 , Firmware Version: OP_V3.3.1-191028 allows an
CVE-2020-23588 MEDIUM 4.3 MITIGATE A vulnerability in OPTILINK OP-XT71000N Hardware Version: V2.2 , Firmware Version: OP_V3.3.1-191028 allows an

References

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