CVE-2021-45423: A Buffer Overflow vulnerabilityexists in Pev 0.81 via the pe_exports function from exports.c.

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-45423 is a critical-severity flaw (CVSS 9.8) affecting pev. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Buffer Overflow vulnerabilityexists in Pev 0.81 via the pe_exports function from exports.c.. The array offsets_to_Names is dynamically allocated on the stack using exp->NumberOfFunctions as its size. However, the loop uses exp->NumberOfNames to iterate over it and set its components value. Therefore, the loop code assumes that exp->NumberOfFunctions is greater than ordinal at each iteration. This can lead to arbitrary code execution.

Why this priority

Critical 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	9.8 (Critical)
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-120
Published	2023-03-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: pev project

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

Am I affected?

Timeline

2023-03-13 18:15 UTCPublished CVE record published
2026-06-17 04:13 UTCUpdated Record last modified

pev project pev DOWNGRADE

Affected: 0.81

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.81

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.81 (Debian / Ubuntu)

apt-cache madison pev sudo apt install pev=<VERSION_BEFORE_0.81> sudo apt-mark hold pev

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

dnf --showduplicates list pev sudo dnf downgrade pev-<VERSION_BEFORE_0.81> sudo dnf versionlock add pev

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-2021-45423?

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

Is CVE-2021-45423 being exploited?

CVE-2021-45423 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-2021-45423 affect?

CVE-2021-45423 affects pev. Severity is critical (CVSS 9.8). A Buffer Overflow vulnerabilityexists in Pev 0.81 via the pe_exports function from exports.c.. The array offsets_to_Names is dynamically allocated on the stack using exp->NumberOfFunctions as its size. However, the loop uses exp->NumberOfNa

How urgent is CVE-2021-45423?

Priority 61/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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