CVE-2016-10511: The Twitter iOS client versions 6.62 and 6.62.1 fail to validate Twitter's server certificates for the /1.1/he

This week

MEDIUM 5.9REMOTEDOWNGRADE

CVE-2016-10511 is a medium-severity flaw (CVSS 5.9) affecting twitter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Twitter iOS client versions 6.62 and 6.62.1 fail to validate Twitter's server certificates for the /1.1/help/settings.json configuration endpoint, permitting man-in-the-middle attackers the ability to view an application-only OAuth client token and potentially enable unreleased Twitter iOS app features.

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	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-295
Published	2017-09-18
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: twitter

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

Am I affected?

Timeline

2017-09-18 21:29 UTCPublished CVE record published
2026-06-17 00:39 UTCUpdated Record last modified

twitter twitter DOWNGRADE

Affected: 6.62 · 6.62.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.62

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 6.62 (Debian / Ubuntu)

apt-cache madison twitter sudo apt install twitter=<VERSION_BEFORE_6.62> sudo apt-mark hold twitter

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

dnf --showduplicates list twitter sudo dnf downgrade twitter-<VERSION_BEFORE_6.62> sudo dnf versionlock add twitter

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-2016-10511?

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

Is CVE-2016-10511 being exploited?

CVE-2016-10511 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-2016-10511 affect?

CVE-2016-10511 affects twitter. Severity is medium (CVSS 5.9). The Twitter iOS client versions 6.62 and 6.62.1 fail to validate Twitter's server certificates for the /1.1/help/settings.json configuration endpoint, permitting man-in-the-middle attackers the ability to view an application-only OAuth clie

How urgent is CVE-2016-10511?

Priority 45/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

iOS vulnerabilities

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References

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