CVE-2007-2770: Stack-based buffer overflow in Eudora 7.1 allows user-assisted, remote SMTP servers to execute arbitrary code

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HIGH 9.3DOWNGRADE

CVE-2007-2770 is a high-severity flaw (CVSS 9.3) affecting eudora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in Eudora 7.1 allows user-assisted, remote SMTP servers to execute arbitrary code via a long SMTP reply. NOTE: the user must click through a warning about a possible buffer overflow exploit to trigger this issue.

Why this priority

Critical severity
Public exploit reference

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

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Published	2007-05-21
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: qualcomm

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-05-21 21:30 UTCPublished CVE record published
2026-06-16 22:40 UTCUpdated Record last modified

qualcomm eudora DOWNGRADE

Affected: 7.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 7.1 (Debian / Ubuntu)

apt-cache madison eudora sudo apt install eudora=<VERSION_BEFORE_7.1> sudo apt-mark hold eudora

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

dnf --showduplicates list eudora sudo dnf downgrade eudora-<VERSION_BEFORE_7.1> sudo dnf versionlock add eudora

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Eudora 7.1 - SMTP ResponseRemote Remote Buffer Overflow

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-2007-2770?

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

Is CVE-2007-2770 being exploited?

CVE-2007-2770 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-2007-2770 affect?

CVE-2007-2770 affects eudora. Severity is high (CVSS 9.3). Stack-based buffer overflow in Eudora 7.1 allows user-assisted, remote SMTP servers to execute arbitrary code via a long SMTP reply. NOTE: the user must click through a warning about a possible buffer overflow exploit to trigger this issue

How urgent is CVE-2007-2770?

Priority 59/100. Critical severity; Public exploit reference

Software pages

Qualcomm vulnerabilities

Related CVEs

CVE-2007-3166 MEDIUM 6.8 DOWNGRADE Buffer overflow in Qualcomm Eudora 7.1.0.9 allows user-assisted, remote IMAP servers to execute arbitrary code
CVE-2004-2649 MEDIUM 5.8 DOWNGRADE Eudora 6.1.0.6 allows remote attackers to obfuscate URLs displayed in the status bar by inserting a large numb
CVE-2004-2005 MEDIUM 5.1 DOWNGRADE Buffer overflow in Eudora for Windows 5.2.1, 6.0.3, and 6.1 allows remote attackers to execute arbitrary code
CVE-2004-1944 MEDIUM 5.0 DOWNGRADE Eudora 6.1 and 6.0.3 for Windows allows remote attackers to cause a denial of service (crash) via a deeply nes
CVE-2004-1521 MEDIUM 5.0 DOWNGRADE Eudora 6.2.0.14 does not issue a warning when a user forwards an e-mail message that contains base64 or quoted

References

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