CVE-2020-36473: UCWeb UC 12.12.3.1219 through 12.12.3.1226 uses cleartext HTTP, and thus man-in-the-middle attackers can disco

Routine

LOW 3.7REMOTEUPGRADE

CVE-2020-36473 is a low-severity flaw (CVSS 3.7) affecting ucweb uc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

UCWeb UC 12.12.3.1219 through 12.12.3.1226 uses cleartext HTTP, and thus man-in-the-middle attackers can discover visited URLs.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-312
Published	2021-08-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ucweb

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

Am I affected?

Timeline

2021-08-14 21:15 UTCPublished CVE record published
2026-06-17 03:15 UTCUpdated Record last modified

ucweb ucweb uc UPGRADE

Affected: >= 12.12.3.1219 and <= 12.12.3.1226

Fixed in: newer than 12.12.3.1226

Safe to downgrade to: a release before 12.12.3.1219

1. Check installed version

apt-cache policy ucweb-uc || rpm -q ucweb-uc || ucweb-uc --version

2. UPGRADE to newer than 12.12.3.1226 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ucweb-uc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ucweb-uc

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 12.12.3.1219 (Debian / Ubuntu)

apt-cache madison ucweb-uc sudo apt install ucweb-uc=<VERSION_BEFORE_12.12.3.1219> sudo apt-mark hold ucweb-uc

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ucweb-uc sudo dnf downgrade ucweb-uc-<VERSION_BEFORE_12.12.3.1219> sudo dnf versionlock add ucweb-uc

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-2020-36473?

ucweb uc: upgrade to newer than 12.12.3.1226. Exact commands for each OS are on this page.

Is CVE-2020-36473 being exploited?

CVE-2020-36473 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-2020-36473 affect?

CVE-2020-36473 affects ucweb uc. Severity is low (CVSS 3.7). UCWeb UC 12.12.3.1219 through 12.12.3.1226 uses cleartext HTTP, and thus man-in-the-middle attackers can discover visited URLs.

How urgent is CVE-2020-36473?

Priority 29/100. Remotely exploitable, no login, no user action

References

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