CVE-2021-20748: Retty App for Android versions prior to 4.8.13 and Retty App for iOS versions prior to 4.11.14 uses a hard-cod

Q: How do I fix CVE-2021-20748?

retty: upgrade to 4.8.13; retty: upgrade to 4.11.14. Exact commands for each OS are on this page.

Q: Is CVE-2021-20748 being exploited?

CVE-2021-20748 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-20748 affect?

CVE-2021-20748 affects retty, retty. Severity is high (CVSS 7.5). Retty App for Android versions prior to 4.8.13 and Retty App for iOS versions prior to 4.11.14 uses a hard-coded API key for an external service. By exploiting this vulnerability, API key for an external service may be obtained by analyzing

Q: How urgent is CVE-2021-20748?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2021-20748 is a high-severity flaw (CVSS 7.5) affecting retty, retty. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Retty App for Android versions prior to 4.8.13 and Retty App for iOS versions prior to 4.11.14 uses a hard-coded API key for an external service. By exploiting this vulnerability, API key for an external service may be obtained by analyzing data in the app.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-798
Published	2021-07-14
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: retty

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

Am I affected?

Timeline

2021-07-14 02:15 UTCPublished CVE record published
2026-06-17 03:34 UTCUpdated Record last modified

retty retty UPGRADE

Affected: < 4.8.13

Fixed in: 4.8.13

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.8.13 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade retty

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade retty

Note

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

retty retty UPGRADE

Affected: < 4.11.14

Fixed in: 4.11.14

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.11.14 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade retty

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade retty

Note

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

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-2021-20748?

retty: upgrade to 4.8.13; retty: upgrade to 4.11.14. Exact commands for each OS are on this page.

Is CVE-2021-20748 being exploited?

CVE-2021-20748 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-2021-20748 affect?

CVE-2021-20748 affects retty, retty. Severity is high (CVSS 7.5). Retty App for Android versions prior to 4.8.13 and Retty App for iOS versions prior to 4.11.14 uses a hard-coded API key for an external service. By exploiting this vulnerability, API key for an external service may be obtained by analyzing

How urgent is CVE-2021-20748?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

Software pages

Android vulnerabilities · iOS vulnerabilities

Related CVEs

CVE-2021-20747 MEDIUM 4.3 UPGRADE UPGRADE Improper authorization in handler for custom URL scheme vulnerability in Retty App for Android versions prior

References

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