CVE-2020-24275: A HTTP response header injection vulnerability in Swoole v4.5.2 allows attackers to execute arbitrary code via

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MEDIUM 6.5REMOTEDOWNGRADE

CVE-2020-24275 is a medium-severity flaw (CVSS 6.5) affecting swoole. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A HTTP response header injection vulnerability in Swoole v4.5.2 allows attackers to execute arbitrary code via supplying a crafted URL.

Why this priority

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	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-74
Published	2023-07-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: swoole

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

Am I affected?

Timeline

2023-07-20 20:15 UTCPublished CVE record published
2026-06-17 03:05 UTCUpdated Record last modified

swoole swoole DOWNGRADE

Affected: 4.5.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.5.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.5.2 (Debian / Ubuntu)

apt-cache madison swoole sudo apt install swoole=<VERSION_BEFORE_4.5.2> sudo apt-mark hold swoole

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

dnf --showduplicates list swoole sudo dnf downgrade swoole-<VERSION_BEFORE_4.5.2> sudo dnf versionlock add swoole

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-2020-24275?

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

Is CVE-2020-24275 being exploited?

CVE-2020-24275 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-2020-24275 affect?

CVE-2020-24275 affects swoole. Severity is medium (CVSS 6.5). A HTTP response header injection vulnerability in Swoole v4.5.2 allows attackers to execute arbitrary code via supplying a crafted URL.

How urgent is CVE-2020-24275?

Priority 47/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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