CVE-2020-13482: EM-HTTP-Request 1.1.5 uses the library eventmachine in an insecure way that allows an attacker to perform a ma

This week

HIGH 7.4REMOTEDOWNGRADEMITIGATE

CVE-2020-13482 is a high-severity flaw (CVSS 7.4) affecting em-http-request, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

EM-HTTP-Request 1.1.5 uses the library eventmachine in an insecure way that allows an attacker to perform a man-in-the-middle attack against users of the library. The hostname in a TLS server certificate is not verified.

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	7.4 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-295
Published	2020-05-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: em-http-request project · fedoraproject

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

Am I affected?

Timeline

2020-05-25 22:15 UTCPublished CVE record published
2026-06-17 02:53 UTCUpdated Record last modified

em-http-request project em-http-request DOWNGRADE

Affected: 1.1.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.5

1. Check installed version

apt-cache policy em-http-request || rpm -q em-http-request || em-http-request --version

2. No fixed release: DOWNGRADE to a release before 1.1.5 (Debian / Ubuntu)

apt-cache madison em-http-request sudo apt install em-http-request=<VERSION_BEFORE_1.1.5> sudo apt-mark hold em-http-request

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

dnf --showduplicates list em-http-request sudo dnf downgrade em-http-request-<VERSION_BEFORE_1.1.5> sudo dnf versionlock add em-http-request

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.

fedoraproject fedora MITIGATE

Affected: 32 · 33

Fixed in: no fixed release known

Safe to downgrade to: a release before 32

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-2020-13482?

em-http-request: downgrade or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-13482 being exploited?

CVE-2020-13482 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-2020-13482 affect?

CVE-2020-13482 affects em-http-request, fedora. Severity is high (CVSS 7.4). EM-HTTP-Request 1.1.5 uses the library eventmachine in an insecure way that allows an attacker to perform a man-in-the-middle attack against users of the library. The hostname in a TLS server certificate is not verified.

How urgent is CVE-2020-13482?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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