CVE-2020-36474: SafeCurl before 0.9.2 has a DNS rebinding vulnerability.

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-36474 is a critical-severity flaw (CVSS 9.8) affecting safecurl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SafeCurl before 0.9.2 has a DNS rebinding vulnerability.

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	1.8% (top 21%)
CISA exploited list	No
Published	2021-08-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: safecurl project

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

Am I affected?

Timeline

2021-08-20 15:15 UTCPublished CVE record published
2026-06-17 03:15 UTCUpdated Record last modified

safecurl project safecurl DOWNGRADE

Affected: 0.9.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.9.2 (Debian / Ubuntu)

apt-cache madison safecurl sudo apt install safecurl=<VERSION_BEFORE_0.9.2> sudo apt-mark hold safecurl

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

dnf --showduplicates list safecurl sudo dnf downgrade safecurl-<VERSION_BEFORE_0.9.2> sudo dnf versionlock add safecurl

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-2020-36474?

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

Is CVE-2020-36474 being exploited?

CVE-2020-36474 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-2020-36474 affect?

CVE-2020-36474 affects safecurl. Severity is critical (CVSS 9.8). SafeCurl before 0.9.2 has a DNS rebinding vulnerability.

How urgent is CVE-2020-36474?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

References

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