CVE-2015-8949: Use-after-free vulnerability in the my_login function in DBD::mysql before 4.033_01 allows attackers to have u

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CRITICAL 9.8REMOTEWATCHLISTDOWNGRADEMITIGATE

CVE-2015-8949 is a critical-severity flaw (CVSS 9.8) affecting dbd-mysql, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Use-after-free vulnerability in the my_login function in DBD::mysql before 4.033_01 allows attackers to have unspecified impact by leveraging a call to mysql_errno after a failure of my_login.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.5% (top 8%)
CISA exploited list	No
Weakness	CWE-416
Published	2016-08-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dbd-mysql project · debian

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

Am I affected?

Timeline

2016-08-19 21:59 UTCPublished CVE record published
2026-06-17 00:35 UTCUpdated Record last modified

dbd-mysql project dbd-mysql DOWNGRADE

Affected: 4.033

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.033

1. Check installed version

apt-cache policy dbd-mysql || rpm -q dbd-mysql || dbd-mysql --version

2. No fixed release: DOWNGRADE to a release before 4.033 (Debian / Ubuntu)

apt-cache madison dbd-mysql sudo apt install dbd-mysql=<VERSION_BEFORE_4.033> sudo apt-mark hold dbd-mysql

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

dnf --showduplicates list dbd-mysql sudo dnf downgrade dbd-mysql-<VERSION_BEFORE_4.033> sudo dnf versionlock add dbd-mysql

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.

debian debian linux MITIGATE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2015-8949?

dbd-mysql: downgrade or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-8949 being exploited?

CVE-2015-8949 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-2015-8949 affect?

CVE-2015-8949 affects dbd-mysql, debian linux. Severity is critical (CVSS 9.8). Use-after-free vulnerability in the my_login function in DBD::mysql before 4.033_01 allows attackers to have unspecified impact by leveraging a call to mysql_errno after a failure of my_login.

How urgent is CVE-2015-8949?

Priority 67/100. Critical severity; EPSS top 8%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

MySQL vulnerabilities · Debian vulnerabilities

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References

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