CVE-2015-7266: The Interactive Advertising Bureau (IAB) OpenRTB 2.3 protocol implementation might allow remote attackers to c

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2015-7266 is a high-severity flaw (CVSS 7.5) affecting open real-time bidding. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Interactive Advertising Bureau (IAB) OpenRTB 2.3 protocol implementation might allow remote attackers to conceal the status of ad transactions and potentially compromise bid integrity by leveraging failure to limit the time between bid responses and impression notifications, aka the Amnesia Bug.

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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-264
Published	2018-10-30
Last modified	2026-06-17

Publisher (CNA): CERT/CC · Vendor: iab

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

Am I affected?

Timeline

2018-10-30 17:29 UTCPublished CVE record published
2026-06-17 00:32 UTCUpdated Record last modified

iab open real-time bidding DOWNGRADE

Affected: 2.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3

1. Check installed version

apt-cache policy open-real-time-bidding || rpm -q open-real-time-bidding || open-real-time-bidding --version

2. No fixed release: DOWNGRADE to a release before 2.3 (Debian / Ubuntu)

apt-cache madison open-real-time-bidding sudo apt install open-real-time-bidding=<VERSION_BEFORE_2.3> sudo apt-mark hold open-real-time-bidding

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

dnf --showduplicates list open-real-time-bidding sudo dnf downgrade open-real-time-bidding-<VERSION_BEFORE_2.3> sudo dnf versionlock add open-real-time-bidding

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-2015-7266?

open real-time bidding: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-7266 being exploited?

CVE-2015-7266 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-2015-7266 affect?

CVE-2015-7266 affects open real-time bidding. Severity is high (CVSS 7.5). The Interactive Advertising Bureau (IAB) OpenRTB 2.3 protocol implementation might allow remote attackers to conceal the status of ad transactions and potentially compromise bid integrity by leveraging failure to limit the time between bid

How urgent is CVE-2015-7266?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs