CVE-2016-10091: Multiple stack-based buffer overflows in unrtf 0.21.9 allow remote attackers to cause a denial-of-service by w

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HIGH 7.5REMOTEWATCHLISTDOWNGRADE

CVE-2016-10091 is a high-severity flaw (CVSS 7.5) affecting unrtf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple stack-based buffer overflows in unrtf 0.21.9 allow remote attackers to cause a denial-of-service by writing a negative integer to the (1) cmd_expand function, (2) cmd_emboss function, or (3) cmd_engrave function.

Why this priority

High severity
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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.8% (top 13%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-04-21
Last modified	2026-06-17

Publisher (CNA): Debian GNU/Linux · Vendor: unrtf project

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

Am I affected?

Timeline

2017-04-21 15:59 UTCPublished CVE record published
2026-06-17 00:39 UTCUpdated Record last modified

unrtf project unrtf DOWNGRADE

Affected: 0.21.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.21.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.21.9 (Debian / Ubuntu)

apt-cache madison unrtf sudo apt install unrtf=<VERSION_BEFORE_0.21.9> sudo apt-mark hold unrtf

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

dnf --showduplicates list unrtf sudo dnf downgrade unrtf-<VERSION_BEFORE_0.21.9> sudo dnf versionlock add unrtf

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-2016-10091?

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

Is CVE-2016-10091 being exploited?

CVE-2016-10091 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-2016-10091 affect?

CVE-2016-10091 affects unrtf. Severity is high (CVSS 7.5). Multiple stack-based buffer overflows in unrtf 0.21.9 allow remote attackers to cause a denial-of-service by writing a negative integer to the (1) cmd_expand function, (2) cmd_emboss function, or (3) cmd_engrave function.

How urgent is CVE-2016-10091?

Priority 58/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2025-65411 HIGH 7.5 DOWNGRADE A NULL pointer dereference in the src/path.c component of GNU Unrtf v0.21.10 allows attackers to cause a Denia
CVE-2025-65410 MEDIUM 6.2 DOWNGRADE A stack overflow in the src/main.c component of GNU Unrtf v0.21.10 allows attackers to cause a Denial of Servi
CVE-2014-9275 HIGH 7.5 UPGRADE UnRTF allows remote attackers to cause a denial of service (out-of-bounds memory access and crash) and possibl
CVE-2014-9274 HIGH 7.5 UPGRADE MITIGATE UnRTF allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code as demo

References

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