CVE-2020-35579: tindy2013 subconverter 0.6.4 has a /sub?target=%TARGET%&url=%URL%&config=%CONFIG% API endpoint that accepts an

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-35579 is a high-severity flaw (CVSS 7.5) affecting subconverter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

tindy2013 subconverter 0.6.4 has a /sub?target=%TARGET%&url=%URL%&config=%CONFIG% API endpoint that accepts an arbitrary %URL% value and launches a GET request for it, but does not consider that the external request target may indirectly redirect back to this original /sub endpoint. Thus, a request loop and a denial of service may occur.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Published	2020-12-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: subconverter project

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

Am I affected?

Timeline

2020-12-20 07:15 UTCPublished CVE record published
2026-06-17 03:13 UTCUpdated Record last modified

subconverter project subconverter DOWNGRADE

Affected: 0.6.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.6.4

1. Check installed version

apt-cache policy subconverter || rpm -q subconverter || subconverter --version

2. No fixed release: DOWNGRADE to a release before 0.6.4 (Debian / Ubuntu)

apt-cache madison subconverter sudo apt install subconverter=<VERSION_BEFORE_0.6.4> sudo apt-mark hold subconverter

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list subconverter sudo dnf downgrade subconverter-<VERSION_BEFORE_0.6.4> sudo dnf versionlock add subconverter

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2020-35579?

subconverter: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-35579 being exploited?

CVE-2020-35579 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-2020-35579 affect?

CVE-2020-35579 affects subconverter. Severity is high (CVSS 7.5). tindy2013 subconverter 0.6.4 has a /sub?target=%TARGET%&url=%URL%&config=%CONFIG% API endpoint that accepts an arbitrary %URL% value and launches a GET request for it, but does not consider that the external request target may indirectly re

How urgent is CVE-2020-35579?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-28927 CRITICAL 9.8 DOWNGRADE A remote code execution (RCE) vulnerability in Subconverter v0.7.2 allows attackers to execute arbitrary code

References

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